Not sure I claimed they were inexpensive! Arches are much bigger than 200 sq ft - and most of the ones round here seem earmarked for more expensive things (Wootton St, Hatfields etc) but there are some less prominent that seemed ok, not as low as seb c want though - they seem to start at 160 pw, not pm.
Try Southwark council maybe, or local enterprise agencies, they should have listings of commercial space, and might be able to suggest office availabilty.
At the size & price you want it may just be a question of putting up notices in newsagents or calling round the estate agents - or try the media types who rent deskspace - but even they start at 2-300 per month typically.
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