No, Which? are independent.
By the same token, according to your logic, why haven't Which? taken a large bung from manufacturers to keep schtum about dodgy tumble driers and fridges.
You can't have it both ways.
I was guessing at a reason for an average boiler always being top of the pops with Which. Perhaps there's another reason. WB are no worse than many other manufacturers that use lots of plastic instead of brass internals. The difference is, WB charge a premium price whereas the others are budget price so you would expect them to cut corners. WB is an average boiler for top money. There are much better for less money.
Recent WB boilers, substandard plastic parts with typical pinhole leaks.
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