How can you skid / How to do skids / skidding

The guy at Evans was very pleasant and enthusiastic but reckoned that if I was going to get one brake I should put it on the back, but I sort of thought that was wrong.

You were right, a back break is almost useless, since your weight will be over the front wheel when slowing down. Plus you can slow the rear with your legs (with practice). Take a look at fixed gear gallery and you won't see any with just a back break.

I used Evans when I was starting out, but after learning a bit a bout bikes I value a good LBS much more. The guy at my LBS is knowledgeable, has a stock of obscure parts, doesn't try to sell me unsuitable/expensive items. When you go to get your free service (or before) get them to change your back break for a front. They should do this, because it was a mistake to give you one.

EDIT; apologies, repeat post.