I've just tried as that pinned article suggested and it still doesn't work. I'm sorry if I didn't read that pinned article but I have now got information overload trying to resolve this, I've had many different suggestions and even people telling me I need script hook V when LSPDFR doesn't require it and there is no mention of it being required in the vehicles readme notes.
Sorry if I have wasted peoples time, I'm done trying and will find something else to play as I've now spent 2 days trying to get this to work.
Thanks for everyones help.