It turns out my boots would need to be sent away to their main depot where they would remove the sole and heel complete (as in one piece) then bond on complete new. The guy I spoke to assured me they would do a really good job and the price would be £72, that includes p&p.
Having had a leather motorcycle jacket repaired locally many years ago (not by Timpson I hasn't to add) which was a rubbish repair involving new main zip and two front pocket zips, I'm a little loath to take the risk.
So have any of you used Timpson to have your motorcycle boots repaired as in new soles and heels

Cheers,
Chris.