Yes I too rememnber the Bayko building set which I loved. Also there was another construction set with tiny ceramic bricks which you stuck together with paste. When you'd built your building and got tired of it you put it in a bowl of water and the paste dissolved and you could re-use the bricks.
My best present ever, when I was a little boy of about 7, came from some friends of my Dad at the other end of the country. It was a stout cardboard box. Inside was a super collection of real tools. Clamps, saw, pliers, screwdriver, fretsaw, a hand-drill, drill bits, hammer,a little plane, screws and nails. It wasn't a kit but a well chosen set of tools for a boy who was already mad on woodwork. My Dad showed me how to use them, and supplied bits of wood. He warned me sternly "I don't want to find you drilling into the furniture." Sixty years later I have a wonderfully equipped hobby workshop but I still have some of those well chosen tools. What happiness I have had from them.