Am sure you will be right cockie but strictly speaking doesn’t the preamble say that no entry starts with a zero rather than saying that a perimeter cell cannot have 0x in it.
I ran into difficulties through misreading the brackets. It is unorthodox to have a single letter AFTER a bracketed expression denoting multiplication. I suppose Oyler did this to fit in with his whimsical style of clueing with words (more or less real ones!) appearing in the clues. A neat puzzle, all the same.
A very neat numerical puzzle, thanks Oyler. To rule out a 0x cell content perhaps the preamble could have stated that every cell contains a number between 0 and 15, with double digit numbers only appearing in some of the perimeter cells.
Well, I've never done that before. I've actually completed a numerical, and everything checks out.
Please don't anyone tell us it's an easy one: I need to feel I'm a genius, for once!
As a total dunce, I've found Listener numeric puzzles a great way of building my Excel skills, though I wish they'd use a normal hyphen in the web version to save me having to edit it when pasting to the spreadsheet - I always forget!