This is really hectic and annoying, the banks doing this for us, where the HO is very beaureutic asking hundreds of things.
I went to lloyds and asked three branches where they simply said they dont have a format also they dont authenticate with letter. however i have to admit he stamped my online printouts. I did travel about 170 miles where I lived before the same Lloyds TSB branch there did a letter to authenticate.
Simply this is because they dont want to move their backs and do some work.
I hope my visa is through and I dont need to go and face this horrible faces again.
Unforfunately there is no way to complain about this anywhere.