Sorting through some material today I found this.  Nice condition for a stamp issued in 1976. It is the higher value of the set with a catalogue value of £0.60.  So not one of the regular 10p stamps.

It shows a Polish jet trainer called the TS-11 Iskra. This was the first jet aircraft designed in Poland back between 1957 and 1960.  The first prototype used a British Armstrong Siddley Viper engine and was flown on 5th February 1960.  Later aircraft used a Polish engine.

One claim to fame of this jet aircraft is that in 1964 the then prototype with Polish designed engines beat four world records in its class, among others, the speed record of 839 km/h (524 mph).  Pretty impressive back then.

Best wishes,           Michael