There's a press report of a fairly similar situation here:
http://www.gooletimes.net/news/3006/banned_dri ver_caught_back_behind_wheel
Initially, it might look as if that driver got off quite lightly (3 year ban, 60 hours unpaid work, supervision order, Think First programme, �55 costs) but reading the article in more depth suggests that the court might have been minded to impose a relatively light sentence because the guy had already spent 2 months in prison.
Having read many reports in our local (Suffolk) press and having done a bit of freelance reporting myself, I'd suggest that a more typical sentence is 3 months imprisonment, plus a 5 year ban. If you've got a good solicitor, you might get a non-custodial sentence but you'd probably be looking at 200 hours unpaid work, plus a Think First course coupled to a supervision (i.e. probation) order and a 5 year ban.
Chris