Well seeing as you skate inlines and you're interested in learning slalom, you may be interested in these (assuming that you haven't already heard of them):http://www.facebook.com/groups/brightonskate/http://www.facebook.com/groups/151710174959797/
The first link is for a street skate group (but it does have lots of avid cone-heads participants), and the second focuses more on slalom. Both groups contain lots of beginners as well as more advanced skaters, so you may well find it good place to learn.
They tend to visit GYSO in Shoreham during the winter, but I don't know if they'll be doing that as much this year due to most people having become really quite disaffected with the way that the place is run and the attitude of the staff there.
My story is pretty similar to yours in that I skated as a young kid (although only briefly for a few months) and then I didn't skate again for more than 30 years. The difference is that I stayed with quads.
I'm based in Eastbourne now (having left my home town of London a few years ago).
Like you, I'm trying to learn new skills. So for me that means not being content to just roll around doing the basics like I did when I was a child; I'd like to be able to do more (and so that's what I'm working on).