I rather liked it! I was expecting an awful episode having read some of the reviews but it really was much better than I thought.
It was a little bit predictable as to what was going to happen and I didn't like the opening shot of Martin and Louisa tied up (as on the box) and then the whole build up done retrospectively.
But there were sub plots going on - Al and Pauline's romance, Bert's birdwatching tours and Mrs Tishell's usual eccentric turn. Perhaps it did lack a little bit of charm at times.
By the way, it's not exclusive to Amazon - you can get it elsewhere and cheaper!