Hi durhamlass,
I have found a William Yewdall. He was born 1810 and was buried, 2nd November, 1834. He was a married man and his "abode" was Harrison's Hospital Lodge. Burial No 2790 at St John the Evangelist. I have found others from St Peter Parish Church buried there. St Peter doesn't have a very big churchyard and so I presume they ran out of space and used St Johns which is also in the centre of Leeds. There are some other Yewdalls' but he is the only William in the index that I searched.
I hope this is your William.
Best wishes,
Elin