Aha. OK I see I should have provided a clearer picture of what I need here:
I've got the boots already, a great pair of Meindl hiking shoes.
When I said 'snow shoes' what I meant was those tennis racket type things which you bind to your boots which enable you to walk on the snow, rather than through it.
I suppose at a stretch I could just hang around some charity shops and try to pick up 2 old tennis rackets but I think the real things are probably better to walk on 