Hi Everyone,
Just for folks info:
Being a novice at doing mechanical work, but understanding the theory and with tips from the mechanics at work, I gave removing the fifth gear repair, described for the 4.1 and 4.2 gen models, a go, as it was a cheaper option than going straight to the shop.
I had the gear, sleeve and synchro case to replace. However, on the removal of the casing I discover a bit of synchro spring where it shouldn't be, so that could be my problem. I am awaiting delivery of that part to, fingers crossed, fix the issue. If not a trip to the shop and bye bye dollars awaits.
Dan