In 1771 he was paid five guineas ″To making of a design of a Theater at Wynnstay″ He was also paid nine guineas for giving ″36 Lessons in Architecture″ to Sir Watkin Williams Wynn. The Theatre was converted from a huge kitchen which had been built for the stupendous Coming of Age Celebrations of Sir Watkin in that year and was used from 1771 until Sir Watkin died. The British Library has a drawing of the Theatre which was used for an admission ticket for a performance which belonged to King George 111.