Hi Markus,
AM,
I think when Markus states 'Luton Beds', that Beds., is an abbreviation of 'Bedfordshire', which is the English county that the town of Luton is in.
I think the coordinates 51n53, 0w25 are the right ones.
According to the chart I get, no planets are retrograde, but Neptune is stationary (D). I take the bracketed 'D' to mean that the planet will move direct after it's stationary period. So there are no retrograde planets, unless we include Chiron, which is.
Markus,
You don't need to shout!

(just kiddin')
There are many methods of trying to glean information upon 'past' lives in the natal chart, or to put it another way, try and find out about 'alternate existences'.
The method of considering retrograde planets as indicators of unresolved prior incarnations is one interesting method. Analysing the North and South nodes is another.
I'm not a wizard when it comes to the technicalities of astrology, I'm more of an imaginist, but for a brief explanation of what the nodes actually are, they are the points at which the path of the Moon crosses the apparent path of the Sun around the earth, and are therefore points of power in the natal chart. When eclipses occur they are always in conjunction with the nodes.
The South node is the past, it is fate, that which cannot be changed, it is the karma we have accumulated and where we are coming from. So in consideration of the topic of 'past' lives, it may have something to tell us about the nature of our existence before we arrived here. The South node is 'the path of least resistance' in this life. It represents that which is least challenging to us, because it embodies old modes of being and that which we are most comfortable with, and so it shows that which we are meant to be evolving away from. As it is fate however, it shows that which we cannot help being, what we cannot change and must work with as a basis for approaching our destiny.
The North node, on the other hand, is our future and our intended destiny. The North node presents us with a challenge to evolve and develop into the nature of that which its placement represents. This is 'the path of most resistance', because unlike the South node, the qualities of the North node do not come automatically, fatedly, but must be worked upon and strived for in order to align ourselves with our intended destiny, and grow into that which we are meant to be in this life, and break the habitual patterns of old.
Your South node is at 0 degrees Aquarius, which is interesting as the transitting Sun was here when you asked your question, which perhaps had something to do with why your inquiry was stimulated in the first place (the Aquarius ingress will always be a good time for you to review the past).
Your North node is at 0 degrees Leo, and is in conjunction with Mars.
I call the South/North node axis, the 'axis of fate and destiny'. Here's my take on what these placements may mean for you.
I don't intend to try and specify incarnations here, but just to give a brief oveview as to where you are coming from and where you are going in the grand scheme of things.
Leo is a sign concerning individualism, pride, self concern and personal glory, as opposed to Aquarius, which concerns the welfare of the whole, shared visions and ideals, socialism and interdependence.
In past lives you may have had your independance and freedom of expression curtailed by the groups or societies of which you were a part. There is a communal spirit about Aquarius, and your South node placement suggests that your individality was hampered by the customs and conventions of those who were around you. it was required of you to keep the peace and to not 'rock the boat' with creative thinking and independant activity. There are past lives in which you were a part of sects, communes, groups or clubs in which a certain uniformity of dress, thought, behaviour and action were required. Perhaps you have been part of cult movements or socialist political regimes. In this life it is your fate to encounter circumstances in which you would naturally forsake your own identity in order to preserve the status quo, to satisfy those around you and to do what is expected of you by kith and kin. This will be easy for you because it is what your soul is accustomed to. It is your 'path of least resistance' to keep your associates happy by not breaking the rules or going your own way by not doing what is expected of you, but these are your circumstances because you are called upon to cultivate independance, creative expression and self concern. You are meant to rebel and do your own thing which is a challenge for you because you are placed in circumstances in which it would be so much easier to keep the peace to act for the good of all around you.
Your North node in Leo is where your challenge and life's purpose lies. You are destined to manifest individual creativity and achievement in your life. You are called upon to break convention and assert your independance regardless of convention or the good of the collectives of which you are a part. Leo is about pride, flamboyance and self concern. In this life you must cultivate understanding of the importance of flaunting one's own ego and opinions. The North node's conjunction with Mars enhances the fiery, lion like qualities of it's Leo placement. You are destined to assert yourself and defend a rebellious and dramatic individuality with tooth and claw. It is required of you to be the king of your own castle, to set the trends and not to follow them, to lead and not to tarry behind, to do the telling and not to be told, and force these qualities through with all the gusto and strength of willpower appropriate to the god of war. A hunting lion would be an appropriate symbol of your Leo/NN/Mars placement, or more appropriately, a lion-cub learning how to hunt, due to the youthful, very early degree in which the North node is placed. Meditation on this symbol can align you with insight into your intended destiny. In what ways in your life have you acted as a lion on the rampage? These are times when you are aligning yourself with your destiny. Do not be a person that whispers rather than roars. This is the pattern you have been following of old. Be a fighter when neccesary rather than a peacemaker to suit all around you. Sharpen your claws and prepare to fight. This is what you are here to learn.
Just a few ideas I had. Tell me what you think.
Draco