I was recently given these beers by a relative, they were clearing their loft and saved these from the skip for me.
I drank a bottle of the Bass 1977 & the Ansells 1977 a few weeks ago. Both had inherited a sherry like flavour during their 33 year storage. The Bass 1977 Ale was still full of life, it was hard to believe it was brewed so long ago. The Ansells was slightly 'duller' with a very strong sherry flavour, almost too much at times!