Family of six. We have had a hard time traveling and making last minute reservations for dinner. Possibly too many of us?
I can list off a good couple of dozen places that you can eat around KX for 6 with no reservations, every type of cuisine.
What are you looking for? Is that 6 adults?
Agree with Nigel. There are literally dozens of places to eat within a couple of blocks of KC. Our hotel was just a block away - we didn't need a reservation for any of the places we ate at.
Dishoom is my favorite discovery last Fall. Here's a link to other spots that I think you'd easily be able to dine at without reservations. https://www.timeout.com/london/restaurants/kings-cross-restaurants
Dishoom, though, is consistently booked solid in advance. (I love it too.)
Loved Dishoom, thanks to Claudia for the recommendation. I saw a Nando’s outside KC, really yummy chicken and no reservations needed. You order and pay at the counter and they bring the food to your table.