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Glossop Leisure Centre and Pool are running an open day on the 30th January, which includes a pool and sports hall triathlon coaching double-session. They are at 6.30pm (pool) and 7.45pm (leisure centre). (A few more details here: http://www.dcleisurecentres.co.uk/centres/glossop-leisure-centre/news/glossop-leisure-centre-open-day ).
You need to phone the leisure centre to book a place. The most interesting thing was that when I did book a place, I was told the people running the sessions were using them to gauge interest in starting up a Glossop club.
I have no affiliation to these sessions at all, other than I have signed up, and the more the merrier! Hope to see some forumites there.