LHR Rain - you missed the point slightly - if you don't settle your 'account' with the company (and that can include agreed repayment terms I'm told) - there is no way to leave other than by doing a 'midnight flit'
While for some this could (indeed has) worked, it's very untidy and you need to be sure that you are cognisent of the implications.
At times I was seriously tempted to hang up the uniform, box the manuals and pile the crappy company furniture into a bonfire but having considered the pro's and con's I just paid up and f'd off.
I got the impression from the pay office that very few have dodged the bond - but that could have just been b-s. Be aware you also get nailed for the balance on your housing account (if you've opted out) and the furnishing allowance - I offerred to pay them what I'd managed to sell my company furniture for - but as it was 10% of the amount they asked for it didn't go down too well!!