My first proper full size road bike was a Tsunoda Grand Prix probably purchased in 1981 or 82. I remember it being bright red with half chromed front forks, ‘grand prix’ was in a white scripted type font on the down tube. It was 10 speed, the rear derailleur was Suntour Honour and it had a chromed steel cottered crank. It also had cheap suicide brake leavers which I soon swapped for weinmann levers with gum rubber hoods which I bought from Phillipsons in Garforth with my pea picking, gardening and paper round wages, all the best racing bikes had rubber hoods!
I’m sure it was bought mail order from a company in the North East, Darlington Maybe, Tensor Cycles rings a bell?
They used to advertise in the back of newspapers.
My brother also got a Rudi Altig from the same company.
Both bikes were cheap, cheerful and really heavy, despite this I loved mine, as all my bikes are now it was kept in fine Fettle.