Dave - feedback as promised!
I really enjoyed these puzzles - my favourite of your puzzles submitted so far. I found that the ones on the left which were entirely filled with shapes fell into place quite easily - I don't know how anyone else tackles them but I found it easiest to draw a set of the shapes next to each puzzle and then eliminate possibilities for each shape. However, I did find that for the ones on the right with fewer shapes I ended up drawing in some of the missing shapes to help visualise which possibilities needed to be eliminated, so in the event I was just making them look like the first grids, but this gave me an extra step to do. Great fun
I would definitely like to do more - maybe with six or seven shapes (glutton for punishment!!)
Not that it matters, but there is a small typing error on the answer sheet - the final row of the last puzzle should start 4,5 and not 5,4.