Thanks Barretter. I had it finished (so I thought) plus the stop-over.
Had correct for 8D - worked out the shortened guinea pig but was taking the answer as 'asian tree' instead of just 'tree'. Had correct for 1A but was using 'tread' for business (synonym in my thesaurus). Now see the other synonym by migrating a letter. Incorrect for 31A - was thinking 'stroke' for caress which would fit but not parse. Now corrected and can go to bed content!