Hi Matty and Neil and thanks for replying.

I have found the number, it's TG2376 it's really difficult to read but I think that is what it says. Can't see any other numbers anywhere.

I Can't seem to add photos so here is a link to an imgur post I have made with the photos:

https://imgur.com/a/KPsRVPV

Hope you can see these OK.

Nigel