I like to start my build threads with a little bit of background and history and although this cars history started all the way back in 1968 my knowledge and involvement with it  began much later than that.   Those of you that have seen my other posts and build thread will know that my involvement in single seaters and specifically Johnny Walker's F4 cars began in around 2014 when I bought my first JW4 Formula four car, one of the first 1966 250cc Mk2 chassis.  Walker only made 56 cars