A bit of an update.
My gloves were worn a few times and were verging on the annoyingly too long.
Then a zip broke, so I returned them to Sportsbikeshop and also explained my issue with the fit.
They returned them to Gerbing to query the fit and have just sent me a new pair of 2xl, which seem to fit properly, and the zip works !
Sadly I'm still not riding due to a shoulder operation, but I can at least sit in the sitting room with my hands all toasty.