Many thanks to everybody - I was on the right track but did not glean from the instructions that there was more than one cypher - I assumed, therefore, that my uncyphered answers which did not make real words when cyphered were wrong - when they had to be right; this caused me a big headache.
In any event, as a last resort for checking the cyphered answers, go to dcode.fr. This will confirm that your your cyphers are correct - it is not much of a cheat as you have to have the solutions in order to check that the cyphers are correct but will sort out any silly errors (I made plenty).
Good puzzle after all that - for me the instructions could have been slightly clearer but, self-doubt apart, I suppose it became pretty obvious pretty early on that there was more than one cypher involved... See you all next month.