Hi, I also received this letter and went into my branch the other day. They have no other current accounts on offer, as keeping this account will most likely cost me £15 a month I advised them that I would have to change to a different bank.
The cashier did mention (under her breath!) that as from 1st December the ultimate reward account will be reduced by £5/month to only £7.50, taking into account that you get travel insurance and mobile phone insurance this will probably be my best option - i'm £6.99 for mobile insurance per month as it is.
The changeover of accounts - to the £1 a day charge - doesn't start til 6th December so i'll be waiting to see if the reduction in Ultimate Reward costs is actually true - meanwhile i'll be checking out other banks just in case!