Engagement present?

Voucher or money and the fizz with special glasses is a nice thought.

A bottle of bubbly and 2 special glasses. It's a joyous occasion and not for mundane stuff - there's plenty of time for that in years to come.

An engagement is a time for celebrating.

Yes I think money or a voucher theses days rather than things for their bottom drawer. Especially if they may already be living together and have all the essential household items they need.

John Lewis voucher or money

Eons ago girls had a bottom drawer to collect things for their future married life. I never had one of those as I’m probably just not practical enough

Not sure that it would occur to me to give them a present at all!
I suppose depends up to a point on how many grandchildren you have and how close you are.
Money would need to be a decent amount, whereas ‘that pretty plate’, ‘that frightful vase’ can always be remembered as a ‘a present from grandmother yonks ago’.

I’d say a voucher would be preferable to actual money

Money always welcome.

Don’t think they want ‘stuff’.