Thanks for all the posts, everyone. I am not going to keep checking this thread as often, now, so I apologise to anyone who posts after this and also thank all who have taken the time to post. It was really just a forlorn hope that I could maybe locate a couple of recorders.

I learnt on a very battered and probably very cheap Dolmetsch and have only just parted company with it to give to a child who was desperate to play. They maybe are not a very good make, but I survived using it, and I remember many friends used them, too. Mine is tuned reasonably and you can get the notes you need to out of it easily.
I remember being very chuffed when I was given it. The child I passed it on to, is thrilled with it. I would love to give him a brand new, top quality recorder, but I can't do that for every child who wants one.
I think successful music teaching is often about making the learning environment positive and providing opportunities for children to play together, as much as possible. That is why I would like all children, who want one, to have their own instrument.
I am not a professional recorder player, so I do not know as much as some about different recorders and advanced techniques, so thank you for all the expert advice, it is useful. I can, however, teach the basics and enable children to have fun whilst doing so. A professional recorder player, may have more musical skill but I have seen some who have not got a clue about nurturing and encouraging a child's self-confidence.

Anyone reading this thread at a later date, who lives in the N Lincs area, who has a recorder they no longer use, even if a bit chewed, please PM me as I KNOW I will almost certainly be able to find a child who would love it,(once cleaned, of course!) teeth marks and all. :-) Thanks everyone, for your interesting posts and encouragement.