Today I feel a little like an ass.
After spending hours and hours studying astrology, specifically the calculation of natal astrology birth charts, then today it hit me how I had missed one important factor. The natal chart requires an accurate time of birth. A difference of just 15 mins (for rounded-up/down times) can make a huge difference. Imagine the stupidity when I realised that the UK birth certificates have no time of birth. I have no idea even what time of day I was born! I spent days creating excel programmes to calculate planetary positions etc. based upon the time of birth for anywhere in the world. Hours and hours… Sure it was valuable and valid — just invalid in terms of applicability to my needs, It is like spending a lifetime designing and building a oil conversion system for cars, only to find that once you are finished with your work then the world no longer uses oil or cars!
Sure, there is a solution. You can calculate multiple charts: midnight, mid-day and 23:59 for the date of birth and then interpret the consistent factors. Such renders some of the specifics pointless. The solution is ultimately a diversion towards Vedic astrology.
Note to self: next time you commence a study of a skill and subject, check on the applicability of the techniques to the local in which you find yourself.