Steve,

I can really recommend Dave at Dampertech (GAZ). He's within easy reach of you too (in a village near to J1 on the M18)
Dave was really helpful getting a pair of older Leda struts refurbed for me. He supplies Hawk too, so knows the type of car.
I think a new pair of GAZ front would match up ok with the existing rears, otherwise you'd wanted to go more expensive on all four corners?