Andy wrote:

One thing that I've not seen mentioned on the group is that Thameslink
(sorry FCC!!) now accept Oyster PrePay at West Hampstead Thameslink,
so extending a whole one station further north. This certainly makes
sense given the interchange with the NLL (and Jubilee line). There are
posters at West Hampstead proclaiming the fact and it is mentioned on
their Website as well.

That's great news, I hadn't heard anything about that.

Previously there was the odd situation where LU printed tickets were
valid to West Hampstead Thameslink, but not Oyster PAYG. From West
Hampstead, FCC Thameslink can work out as a good alternative route
into town.