After yet another fruitless visit to a shop to try on various makes/models of approach shoes, only to find they're all too long and narrow for my feet, I think some more research is needed!
Another vote for Oboz. My pair are nearly 4 years old, been worn extensively on rough ground and still going strong. Only downside they're not very grippy for scrambling particularly in wet stuff
Thanks for the replies. I tried some TX4s recently, and they were nearly a good fit - just a little too long compared to the width, which meant some minor heel slip.