I think you'll find the Mayland was actually made in Mayland, near Malden in Essex I think and that's how it got it's name. They were prolific builders in the 80's I remember and made lots of small boats particularly for anglers. You might get a better result with the skiing and small angling boat sites or try Jim Whippy at Boat Fishing Magazine. ( jim.whippy@btopenworld.com)
Still made I'm led to believe. Nauticalia boats at Shepperton on the Thames still sell them and have the specs etc listed on thier site. Might be worth a look.