As per title,
14 is what our cousins across the pond use so what would this be in uk wire?

2 square mm

see link

http://www.rbeelectronics.com/wtable.htm

Adrian

Thanks.
So that would be about 15 amp

Current rating also depends on the insulation not just the wire area. For example 18AWG aircraft spec 44 wire will handle about 20Amps