I would also recommend Nessy. My kids both have dyslexia and times tables and telling the time are huge issues for them. I noticed that swatch do kids watches which look really helpful in identifying the minutes and hours and the minutes to and past the hour. There are good ones for older kids too - not all butterflies and sports cars!
Thanks all. Yes! DC does have ‘mild’ dyslexia. I didn’t realise all our house wall clocks had Roman numerals and so that was used as an excuse. The school watch had been lost. It’s becoming an issue. Lots of the telling the time games and books I’ve found seem to be aimed at much younger children.