I have been with National Girobank/A&L since 1969. Like all the other banks A&L was offering next to nothing in interest for existing customers but £100 and 6% interest to new customers who switched to them. This pxxxxd me off so I opened an Reward Account with Halifax Bank to get the £5.00/month bonus. As far as that went all is OK.
However, the problems I have had using what the Halifax call their "Great Transfer Service" in changing my DDs have been enormous. Two months after opening the account I am still have to phone round different companies to find out why the DDs haven't been changed over yet. All this the Halifax said they would do easily. It appears that after the write to the various companies that's it. If they don't respond they tell you to sort it out yourself.
Whilst with A&L I had no problems, I moved due to lack of current account interest.
I have come to the conclusion all banks are as bad as one another. Unless you know differently.