Apologies if this has been covered elsewhere and I've not managed to see it.

Is it possible to claim Avios on my booking.com hotel stays that I haven't stayed in yet but booked without using the BAEC estore page? Appreciate I can attempt to claim 'missing' points once I've stayed, but It would be preferable if I was able to rectify it prior to staying at the hotel(s),

Similarly I just bought tyres through Black Circles yesterday only to realise you can also claim Avios - but I think it's maybe pushing it to try and claim these?