Wow - get this - if you complain about the illegal charges a bank makes, and take them to court to reclaim costs, the bank may close your account.
Appears to have been happening with the Alliance & Leicester:
BBC NEWS | Programmes | Moneybox | Bank account closures criticised
Banks which close the accounts of customers who take them to court to reclaim their bank charges have been criticised by the Financial Ombudsman.
In an adjudication it said the Alliance and Leicester's closure of one such customer's account was neither fair nor reasonable.