[Tannaton]

I did mine using genuine B&Q 8mm drill bits..... :-) Although it's twin cam they are linked with a chain so there is only one camshaft sprocket to lock.

I also bought the genuine Volvo kit of parts and found the belt was "gates". If it was a Volvo (5-cyl) engine I would always use genuine bits but for this engine in future I would get the Gates kit which is around 2/3 the cost.

And yes a good idea to do the AUX belt and tensioner.