Just a quick apology to all those who've emailed me with questions , comments etc. and haven't yet had an answer. Basically my inbox is groaning under the weight of all the replies I've had to a survey I started a while ago here:
I didn't expect such an enthusiastic response but it obviously struck a nerve and I'm just finishing correlating all the info. I'm closing it now and will let you know some results in a few days time.
Many thanks to all those who took the time to reply.