Wonder where all the old ones are stored.
Some were sealed in drums and dumped at sea.
Some were buried at Harwell, recently they were dug up, there was a great big inflatable tent erected over the excavations whilst they were removed and sent to Sellafield, where I believe they were dismantled and the Tritium recovered.
Apparently Harwell had broken the disposal regs by burying them, and were fined by Wantage Magistrates court.