Bird egg ID

[sebastianbawn]

Found in Bristol, no other info im afraid

[valleyforge]

Without further info on size and whether or not the photo represents a clutch within an in situ nestsite, then I'd hazard a guess that they are from a gull ... common gull, or herring gull are possibilities, but the apparent lack of any nest structure at all, might more properly suggest the lesser black-backed gull as being the most likely candidate.