Trying a constructive comment :
The seattube is probably repairable but to recreate the curve + indent must be a harder job than most cracked straight tubes, so would likely cost more than 200£. Adding to that seatpost uncertainty, and repaired frames fetching about 300£ on ebay, not certain £175 makes it an attractive prospect
It's such a random item; a nice new frame damaged but hasn't obviously been crashed. Perhaps a CF repair person can spin a tidy profit on it should they have the skills and materials to hand. Probably best to just let it run and see what happens.
Trying a constructive comment :
The seattube is probably repairable but to recreate the curve + indent must be a harder job than most cracked straight tubes, so would likely cost more than 200£. Adding to that seatpost uncertainty, and repaired frames fetching about 300£ on ebay, not certain £175 makes it an attractive prospect