How many seats are free
BFI publishes a count per performance, so the alert carries a real number rather than a guess.
BFI IMAX · Waterloo
Sold out at BFI IMAX is a snapshot, not a verdict: cancellations and expired holds free seats all day. Ticket Sniper reads the booking page and messages you when the count moves.

Be honest about the data
BFI publishes a count per performance, so the alert carries a real number rather than a guess.
There is no public seat map, so two free seats may be rows apart. Vue alerts promise adjacency; BFI cannot, and we do not pretend otherwise.
Extended runs appear on the booking system before they are announced. That is often the easier way into a sold-out title.
Good to know
No. Ticket Sniper never reserves, buys or resells a ticket. The alert links to BFI’s booking page, at BFI’s price.
No. The Science Museum’s Ronson Theatre also runs 70mm film prints, on the same terms. One IMAX 70mm watch covers both.
Continuously, alongside the rest of the London cinemas. Waterloo returns often go within minutes, so the alert links straight to the performance.
£3.99 a month across every live city and supported film, cancellable online at any time.