There is nothinhg in British, or most other countries laws to stop any one photographing who or what they want when they want, in a public space, even if the subject of the photograph may be in a private place. A fenced garden for instance, visible from public land.

UNLESS it is decided in a court that it is against the public interest, the ban on photographs in Parliament square, for example, or a breach of security, at military sites, or the subject has a court order banning the photographing of....XYZ.

THIS last one however is notoriously difficult to get a nick on, and the fines, except in certain well known cases, Bloody stupid Diana for example, are miniscule.

And WHO is going to be able to afford to take Google to court because their front door is plastered all over T-Shirts in Outer Mongolia?