Jillybird, I sometimes I wonder whether hopeless SPAG is a requirement for being an estate agent! Not just apostrophes, but the shower cubicals, flower boarders, etc. And so often, nobody seems to care, let alone proof-read anything.
EAs are much less sloppy/more professional in some other countries, e.g. the US, but then they do have to have a professional qualification, and charge substantially more than is usual here - 5-6%, as my sister who lives in the US has told me.
Army horses loose on London streets