Ok I dont have access to this, email from son.
They have an induction hob and the hob has been bonded to the work top
at either side. Apparently its not silicon.

Any ideas on how to loosen the bond to remove the hob.

My understanding is hob has a metal lip that attaches to the worktop at
the sides.
The worktop is granite. Any prising to release it would crack the glass
hob.