Cylinder head

[pheelay]

So I have the ZS now at an independant garage to replace the head gasket (1.4 16v K-series). I've sourced the parts for them and agreed their price for the labour. Sent them MLS head gasket kit, head bolts, new oil rail, sump gasket, thermostat, oil filter.

They called me yesterday suggesting the head should be verified for warpage by an external company (presumably a machinist?) at a cost of 140?. Maybe a daft question, but what should this typically involve and is it worth getting it done? They indicated that opting not to do it would risk another HGF but at that price (+ an extra 80? to fit the oil rail), it seems worth the risk.

Thoughts?