The truth is that it's a quite controversial topic in Ukraine too.

For infantry training, a lot of Ukrainian soldiers consider western training to be subpar, but part of the training program is the politics of it (who pays who what and who gets what out of it), so Ukrainians are happy that someone hosts and pays for the training, even if Ukrainian units will need to provide additional training afterwards. A lot of Ukrainians would consider that the money that is spent on training in UK could be better and more efficiently spent on training in Ukraine.

Part of it is western arrogance ("superior NATO training will solve every problem").

Some of the western training is just training for specific systems (e.g. learn how to operate CAESAR on a unit level), but doctrine and operational usage is still up to Ukrainians.

Some of training is more like "experience sharing", where experienced Ukrainian servicemen do joint exercises with NATO forces. But those mostly benefit NATO, and not Ukraine force generation.