I have none of the Whitworths left from my MG sedan days. That was two cleaned out tool thefts ago.
As a flat rate auto tech I do have the willingness to take anyone of my tools to the torch and grinder to get the job done. You learn quickly to scrounge the garage sales to always have some medium quality modifiable wrenches and sockets in common sizes. Save the high quality tooltruck brands for worn out warrantee returns.
Only took me 45 minutes to supplement my Lister/iod tool kit to have a complete made up set.
Metrinch (spline type fluted -- grabs on the flats not the corners) sockets work great with the open clearances on these engines.
No auto manufacturer designs any servicability into thier designs any more. Everything is designed for the absolute minimum amount of human manufacturing labor and the maximum robotic assembly. That is why all of the special self centering fasteners and special quick to connect, hard to disconnect, easy to leak hoses and lines. Servicablity has no priority and is a figure it out later with no reguard for cost by every manufactuer. GM, Ford, Chrysler, Honda, Toyota, Saab, BMW, MB, VW, ect. Yes, even Saturn. Been there, done that and have the scars too prove it. The mechanical side of things can always be figured out somehow. It's the software side of things that WILL drive you back into the dealer. And that IS intentional. Even with $2000-3000. personal and $5000-15000. shop electronic/info upgrades a year and we were still always 3 years behind and never more than 40-50% as capable in an Independent shop reprogramming as I could do in a dealership shop. Its just the dealership pay/reward systems were so . . . brutally mercenary, even as harsh and hardnosed as I am; I could only take it for 7 years and have any humanity left.
So I'm back where I began: cutting and selling firewood. What you see is what you get.
SteveU.