Apologies if this has been raised before - you must forgive me for getting
lost in the many threads.

I'm wondering if there are Oyster card readers on Thameslink - specifically
at the following stations:
Kings Cross
Cricklewood
Hendon
Farringdon
Gatwick

If anyone can shed some light on these I'd be much obliged. Again apologies
for raising this if it's been raised before, but I'd really like to know how
Oyster works in conjuction with Thameslink.

Thanks,

Alan