Thanks all - the Bont's, Lake's etc look very nice - but far too expensive for the use I need. The sidi's are brilliant for audax, but wear out too quickly if I use them on errands. Hence looking for cheaper wide shoes.
I've made my peace with the Shimano EX300 touring shoes - they work fine on the freewheel bikes for short rides, walk really well, and are cheap to replace when the sole gets worn and slippy.
I can see Sigma have the next model up for 40% off, and they have boa's, not laces: Laces are a bad idea with fixed. So the plan is, for as long as carer duty continues (means no long rides) then I'll just share the miles (mostly walking) between the cheap touring shoes - the boa for fixed, and the laces for gears.
Thanks all!