Well I found the little SOB **$$£££>>>"%^& bugger. It's not quite where it says on the diagram and is right difficult to get at. I'll take a picture when I get the new one and fit it. It has two relays in it, one for the RHS indicator and one for the LHS indicator.
Interestingly the case of it says no more than 4 bulbs however there are 8 bulbs in the system (two each side on the front, one each side on the rear and two repeaters. Will be interesting to see what the new one says.
Anyway befoe I get the picture done, if anyone else needs to find it, it is a square relay box about 1 1/2 inch cube which is slotted onto a bracket which is bolted to the steering column support. If you look directly up with a torch from the centre rear of the under dash panel (you can just get it without dropping the dash as I found having taken it apart). Easiest way to get it off is to pull it off the bracket and you can drop it down to the RHS of the column and you can then reach it to pull off the wiring connector. I took mine apart and checked the relays and one relay coil is almost completely knackered - it will energise once or twice and then it doesn't work anymore. I tried cleaning up the contacts but to no avail so I guess a new one is the only option.