not SE1 or Camden, but I had them done recently at a photo place outside the tube station at Charing Cross. Very friendly; only passport-photo place I've been in that had a mirror, hairbrush & various clips & hair products for last-minute adjustments! Most passport photo places should know the requirements for visas etc.
I think if you're handing your Indian visa application in to their office in Victoria (Wilton Street, I think), then you can also get the photos taken there.
I just got my Indian visa, searched everywhere for 2x2 photos then realised that they do them at the visa centre in Victoria, like Jessica Kennedy said. Cheaper too
There's a place opposite Selfridges (sorry not SE1 I know) that does the best passport photos. No specification seems to phase them and the photos always look half-decent.
Look out for the small sign. It's on the second floor if I recall.
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