The following line in the ParseNMEA function is the one that does the conversion from WGS84 to the British Ordinance Survey coordinates.
It sounds like your problems are now solved, I do know that there were issues caused by different local number formatting which were raised and resolved in one of the comments.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.