I had a credit limit on my creditcard of �11500 and an outstanding balance of �5000. I noticed today, the bank seem to have slashed my credit limit to �5300. Can they do this, they haven't even informed me?
The Credit Card provider can set your credit limit to whatever they like based on their assessment of the risk in lending to you (the Agreement you signed up to should have a clause to this effect) however they should inform you ahead of time (e.g. 30 days) of any such change which would disadvantage you.
Barclays once did this to me, for no apparent reason. I'd never missed a payment, but all of a sudden, my good credit limit fell quite dramatically. I paid them off in one go, and've never bothered with them since.