Gregss & Subway are attested by FHRS entries) (see https://gregrs.dev.openstreetmap.org/fhrs/district-23.html. I would imagine that the Spar is the convenience store associated with the petrol station (so Eurogarages as owner). Quite possibly the Greggs & Subway elements are counters rather than full operations, in which case I wouldn't map them, but the FHRS Ids suggest separate management so perhaps shops-in-shops.