My first thought was to reply "that's outside the contract and subject to my standard rate". What's the standard rate? £400/hour for this, including set-up tim

My first thought was to reply "that's outside the contract and subject to my standard rate". What's the standard rate? £400/hour for this, including set-up time, transferring the files etc. The number doesn't even matter - just make it big enough to be worth your while in putting up with such nonsense.