Fair enough, I should have examined the frame more closely when it first arrived, my mistake – I just started sorting it out in a fit of enthusiasm. This is a mistake I won't make again.
My intention with this thread was NOT slag off the seller, nor to identify him in public, nor to go through all of the various issues raised in my dispute with him. All I wanted to do was to try to establish whether the damage was significant (and thus by inference whether or not it met the sellers original description).
To be fair the consensus on here appears to be that whilst the damage doesn't tally with the description, it probably isn't structural enough to worry about.