Bertie Sayers built several cars, including the 2 different pictures already on this site. If you look carefully you will notice that he put his logo 'Aberties' on both of them. I believe I may have found an Aberties in Devon but I am awaiting confirmation of this in the next week or two.
He built a roadster in the early 60's for a friend, similar to the autocross car. This car was fully restored in the 80's by the owner, I have a photo of this car after restoration, but it will take some while to find it.
Apart from the 'mud plugger' already pictured, he built at least 3 others. The last one of which was quite revolutionary at the time, it had 'loop sprung' suspension at the front and cable stearing [to do away with stearing box] thereby saving weight.