It will be a Czech made instrument imported into UK by Boosey & Hawkes in the 1960s & 70s. They are very variable - OK to dire and now about 30-40 years old. But not as bad as the Chinese Larks from the period.
I had a Mk11 a couple of years ago.It had the Bundy, of that period, problem of peeling varnish.Apart from that it was solidly made and played reasonably well,bit on the 'stuffy' side though.