I went on a course last weekend run by DIY Framing . £99 + VAT.
It was great fun. We learnt to mark up and cut a bevelled mount aperture, how to cut glass to size, do mitre joints / clamping / underpinning with v nails etc. and all came back with a limewashed frame we had made with a photo etc. mounted. Looked very professional !
They also have a shop onsite selling tools / supplies to the trade. I have just had a pile of photos enlarged so I think it might be something I pursue as framing on the high street seems to cost a fair bit.
I'm not really an arty person (aside from the gardening and photography IYSWIM) so it was really nice to do something with my hands.