Thanks for the support guys I was ready to give up last night. The supplier has offered me a rebate if I repair them myself or to return, I decided to have a go myself. Managed to split the glass off the unit by using a heat gun, Stanley and penknife and spraying WD40 into the union to stop the sealant sticking back together when cool, works a treat by the way one of my old tricks! You can see in the picture below that the inner mount has broken in two places, hard to see how it has happened really. First stage is to glue back together with some high strength ruberised CA that I have then I will make some reinforcing brackets in aluminium, should work ok.