Lovely bottle of port, or perhaps a few for tasting - I have a 30 year old and a 2009 colheita I am looking forward to this Christmas.
Really good smoked salmon. Pinney's is excellent but no idea if they deliver, or fortnums is lovely, though obviously outrageous.
Maybe a fortnums hamper to open? They have a cheese and wine one I have been lusting over but can't actually justify the expense of. I also love their loose leaf tea and their "lossus" (chocolossus etc) biscuits.
Could do an Ocado order - their picard Frozen stuff is great and they also do "reflets de France" (sp?!) which is a great selection of proper french cheeses.
Waitrose do a fabulous saussicon sec.
If you don't have lovely crystal glasses, I would be tempted to add them to the list. I love a champagne coupe, for example.
One thing I spent a big chunk of money on recently, and enjoy every day, is a lovely cutlery set. I went for Robert Welch, Radford, but there are lots of great suppliers.
Not sure if it's too late for Christmas but we've never had a bad thing from here: https://www.lavialla.com/en-GB/orderform/olive-oil/olive-oil/ though they are jolly expensive.
I like the idea of buying some lovely ornaments/lights etc that you can reuse year on year. You could also consider doing the same thing with an advent calendar.
Do you want any board games etc for the family? Or to hold a big, fabulous new year's eve party?
I hope you can use the money to have a memorable Christmas OP.