I've found that my local Nat West where I have my business account has installed a whizzy spinning cash counting machine. Open up the lid, pour a bucket load of coins into a circular sieve, shut the lid, and then it spins round very fast so all the coins get distributed out, and then it gives you a printout for the amount paid in, which you then take to the desk to get added to your account.
That way, the staff don't have to handle dirty money.
And it takes the old pound coins.
Much better than those Coinstar machines that some supermarkets have, to exchange coins for notes, which charge about 7.5%.