Lost Cat??? Or just visiting our place?

Does anyone know who this large quite friendly - I think neutered tomcat (no collar) belongs to? He/they has an oddly coloured pupil in one eye like a brown spot among the green.

He’s been around a fair bit last couple of days - possibly lost and seems to be unsure where to go. Been around my garden (Chesterfield Gardens) all day now, hanging out in my cats favourite sunning spot so quite mellow..very surprisingly my two cats aren’t that concerned about his/their use of the garden furniture so obviously a friendly sort of cat and not too pushy..

Meanwhile sorry if duplicate posting, I seem to have messed up/lost

my earlier attempt to post this with images using an iPhone when trying to edit for spelling error.. I’ll leave the shed open for him tonight so somewhere safe to sleep if still here when dark.