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This does look somewhat like a house sparrow/tree sparrow hybrid - though there is no obvious cheek spot but it has good clean white checks and a largely brown cap, with some just slight grey flecking. I have seen a couple of hybrid birds over the years - neither looked as well marked as this one.
In fact, this bird is very reminiscent of the male Italian Sparrows that I was watching hopping around the legs of the tables in the hotel’s patio restaurant in Riva del Garda (northern Italy) a couple of summers ago. Intriguing.
This bird does resemble a male Italian Sparrow, but I believe that there is evidence of Tree Sparrow parentage if you look closely.
The partial white collar is more extensive than would otherwise be expected, and there is a hint of a black cheek spot (joined to the 'point' of the chestnut cap which extends on to the cheek).
Also see this observation:
Lat/Lng: 51.5, -1.3
OS grid ref: SU5388