I think Mr Dan Smith also needs to familiarise himself a bit better with LCAH T&C.
Vouchers are and have been fully transferrable and you can use as many as you want. The hotel certainly did not bend over backwards for you.
And if you need to educate him a bit, here is the link:
https://www.accorhotels.com/gb/suppo...one-else.shtml
Bad enough if staff don't know the rules. But for a resident manager?