Yes Bri, The Observer's Book of Aircraft does say the aircraft was from Letov, it gives the designer as Karel Thomach. It goes onto say
...was flown for the first time on April 23.1956 and this trainer is now in quantity production for the Czechoslovak Air Force and will possibly be offered for export. The first production Tom-8 trainers, manufactured by the former Letov company , were delivered in 1957.
Mel