Airpolice
Why shouldn't he be aware? He seems keen enough to find out all the rules.
Don't be so presumptuous.
As for the question.
Nothing in the rules to prevent someone paying for someone else's flight training.
I can't see what the taxman has to do with it either, your employer could call it salary, training expenses, whatever, but nothing to do with CAA rules.
If you take your employer as a passenger the cost must be shared, but that doesn't stop your employer giving you a brown envelope for Xmas!