Leftover 2020 UKSC Puzzle

Here's a leftover puzzle from the 2020 UK Sudoku Championship.  I had thought to keep it in reserve for future years, but I think Sam has already seen it and he might want to take part.  Anyhow the reason this wasn't included was because Sam's puzzle was much better.  Not that this one is bad or anything though.  Enjoy!

    #344 Diagonal Sudoku – rated medium

All puzzles © Tom Collyer 2009-20.