Have just dug out the contract and (of course) they can do it - the wording is:
"The Company reserves the right to add a temporary surcharge to the price if the wholesale market price increases by more than 20% above that of the Agreement date or increased transportation costs."
I suspect they can just hide behind "increased transportation costs" here as they can make up any cost increase to levy the surcharge.
I can't seem to find anywhere online that will tell me what the wholesale price of LPG was on 21/12/21 and what it it today to check the 20% increase position - does anyone have any insight they can share here please?
Thank you.