Yes there was a similar thread last year, about expensive gifts etc, etc. An opportunity to teacher bash, I think. All the same old, same old came out about how greedy teachers were, how Parents couldn't afford gifts, etc. The truth is schools do not expect Parents to fork out massive amounts of money to go into a kitty for teachers, (or buy expensive gifts), nor would they be allowed to demand it, either - certainly no school I ever worked in. The LA would certainly have something to say about it.
If a PTA has sent out such an email/letter they are out of order and the school will have to rescind it.
I'd be interested to see the content of the letter. Perhaps it was suggesting (and I'm only surmising here), that anyone who would normally give a gift to a teacher could, instead, if they wished to give a donation to a charity (but I stress, only if they wanted to - a school cannot force a Parent to give x amount of pounds per child to the school in lieu of a gift).
I suspect it's yet another urban myth doing the rounds.