Hi Titchgamer,
I did go into the controller mapping tab, there is a lightgun option in there that by default was set to mouse. However when I set this to lightgun, it still didn't seem to recognise it.
The odd thing is when I load up a rom and press tab to navigatet the menu, I scroll up and down using the light gun, its bizarre.
Maybe I should try and use MAME instead of MAMEUI but from my understanding it is complicated to set up.