Ok update, possibly may of found the issue (not getting my hopes up thou :lol: )
I took the drums off and gave them a good look over and measured the wear and basically if the info I have is right they are both knackered :lol:
My understanding is as new they are 250mm (+-0.2mm) and the wear limit is 251.5mm bearing in mind that your supposed to use over sized shoes liners when they get to 251mm (+-0.2mm)
The right hand side which is the suspected problem measured just over 252mm so well beyond the limit even with oversized liners!
Also the inside was very scored almost it almost felt ribbed when running my nail along it
The other side (the suspected good side) measured 251 and bit mm so right on the limit but better then the other side
The inside despite looking bad in this picture was a lot more shiny and smooth
So in summary the right hand side drum is a lot worst and doesn't look like its scrubbed shoes much at all so hopefully found my issue.. hopefully
I bought a new pair of drums finally tracking them down from GSF seems everyone is out of stock of these at the moment sadly I haven't fitted them as they introduced a nice little issue which is explained here:- http://forum.earlybay.com/viewtopic.php?f=4&t=30016" onclick="window.open(this.href);return false;
I swear this van hates me its alway one step forward two steps back :lol: