Santander do an eSaver account that is 2.75% for 12 months, with unlimited withdrawals/deposits + a cash card that allows you to draw out £300 daily.
I went into my local branch to discuss the account, and you can choose to receive the interest monthly or annually, and you can even have the interest transferred to a current account that's not with Santander.
I'm a student going to university and I thought why not put a bit of money away - I'm with Natwest at the moment and they have a 1% Savings account...so for me it made sense to take one of these out.
Obviously remember to take your money out at the end of the 12 months, as it does go down to 0.5%
I also had a chat with the advisor about putting my wages in...apparently they do random checks on accounts and if you're getting giro payments or something similar they close the account down. You can however make standing orders to transfer into the eSaver account
Also in terms of paying in physical cash, Satander operate a system where you go to a Santander ATM which dispenses envelopes, you key in your details, put the cash in the envelope and it shows up in the account a few days later
Also, interest is calculated daily and then added to the balance monthly or annually, depending on what you prefer.
but hey, everyone could do with a little extra money.