I remember the telegrams they sent out, as you paid per letter they simply had RTU on them ( Return to Unit for those that do not know )
If I remember correctly a couple were on a driving holiday in France and were flagged down by some gendarme who told them to RTU, getting to the ferry it was full, but they were expected and some poor family was offloaded to get them on.
I was heading home and getting to Waterloo Station there was a chalked sign at the platform gate and everyone was being turned round and sent back to whatever stations they came from.
An MT bod I think was sent to deliver a load and arriving at the dockside was told he was going, telling them he had only what he was wearing he was told wifie was packing his bags and they were following shortly.