She definitely did play in Boston Lincs in the early 80's. I went and she was terrrific, absolutely not a look a like. It was during a low period in her career and she did the full act, with backing singers/dancers, and a brilliant pianist. Concert was in a cinema/theatre in the centre of Boston, near the river. It's probable been demolished by now.
(This may be a duplicate of my answer done before I registered on this site - sorry).
The best concert I ever saw in the UK.