Before reading the replies, I reckoned on £23 for a 6 weekly. This would go to £34.50 for 12 weekly (I don't do 8 weekly unless a 6 weekly ends up getting delayed).
However, if you were calling the bit of facia on the top bays part of the regular framework (up to the lead), then it would be a bit more. Those little flat roof type bits can be a major pain with runs when there is no guttering. Indeed I think I would point out to the customer that ingrained run marks may not come off.