IIRC, about 1965 the going rate was 10/- per day.
However in winter 63/64 at Lindholme we were encouraged to have one of the new flu jabs. The encouragement was Wg Cdr Cape, OC Flying, saying that anyone off sick with flu, having refused the jab, would lose their flying pay.
Now half the students were abbos and credulous. I don't know about the older and wiser ones whether they had the jab. I am pretty sure it was an illegal threat.
On a similar note, I recall when annual blood tests were introduced in late 70s we had to sign a consent form. We were told we could decline but would lose our flying cat. Hollow threat? If all aircrew had refused I think it would have collapsed. I think even then we were inclined to believe authority.