Yea, had the same email, although I was paying £7.50 for my account which was still a bargain for a business bank. They have put it up to £9.99. month which I've been expecting for a while as they have never increased their prices for over a decade. It's still very good value.
They have now added a charge for paying in cheques, think it's 70p per cheque. But I stopped taking cheques years ago.
Suck it up, like we expect our customers to do when we increase prices.
A Lifetime Product only really refers to the period during which the product is on the market which is embedded into their terms somewhere.
If you want free banking just use your personal account.