Dive bottles can come with two types of fittings, these are A Clamp or Din.
Make sure the fill station you get matches the bottle fittings.
BZ Paintball in Stockton not far from you, do Din fill stations for £50.
Easy fit the fill station to the dive bottle connect the fill station to you HPA bottle and turn on the dive bottle valve (Note:- turn on the valve slowly, filling at approx 100psi/sec is recommended).