Interesting comment from tubby.
Many years ago, the subject of RTF failure came up at one of our 'pilot/controller forums'......Held at a local hostelry, over beer and chilli/curry.
When we asked the question....."What would you do if you experienced RTF failure while flying a SID"?
Several pilots from the same operator agreed that they would squawk 7600 and return to the inbound hold.
"If you think I'm going to the Iberian Peninsula, Greece, or The Canaries without a radio, think again", were the reasons given.