Somebody's claimed my roulette win!

Dear Mark, I was involved in an incident on a roulette table that involved another player claiming my two £25 chips on black as his, plus the winnings. The dealer immediately called over the pit boss to sort it out. He told us he would call upstairs and see whether the game was on film and would ask them to review the tape. He came back and stated that they were not taping the game, and his decision was to pay the winning bet, and we were to split it, which meant just getting my money back. I was under the impression that everything that goes on in a casino is on tape. Was this a wrong assumption? John A.
Partly, still, your question, John, does not state if the pit boss asked the dealer what each of you had previously been playing.
If you had been betting £25 checks on the outside for half an hour, while the other person had been playing the inside numbers with roulette chips, that pattern might have led to an appropriate decision independent of rolling cameras.
The video cameras concealed in those large plastic smoke-colored bubbles suspended from the ceiling can scan every square inch of a casino. They can even zoom in and read the serial number off a twenty-dollar bill. These cameras are manned 24 hours a day from a control booth by trained surveillance employees.
Cameras are pointed on progressive slot machines, the cashier's cage, counting rooms, table games, or anywhere that peering eyes might help discourage larceny. What the casino doesn't have is a crew of 200 people staffing 200 cameras and reviewing 200 VHS films. Consequently, not everything that goes on in a casino can be filmed for possible review.
When an incident occurs, management can call surveillance to see whether the episode is on film. If not, the Wisdom of Solomon (your friendly pit boss) will make a judgment call which, by definition, cannot please all players.