What sort of head are you after?
http://www.clerkenwellscrews.com will no doubt have something which would work and you may be able to go in person if you're in London?
Otherwise as long as it's not something special head wise then Halfords/B&Q/Wickes/Maplins/etc. usually have smaller packs like so: http://www.halfords.com/workshop-tools/garage-equipment/fuses-electricals-fixings/halfords-socket-cap-screws-m6-x-20mm-hfx253
went to clerkenwell screws in lunch they only had socket head .. I need button head. Will keep looking.
@amey started
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What sort of head are you after?
http://www.clerkenwellscrews.com will no doubt have something which would work and you may be able to go in person if you're in London?
Otherwise as long as it's not something special head wise then Halfords/B&Q/Wickes/Maplins/etc. usually have smaller packs like so: http://www.halfords.com/workshop-tools/garage-equipment/fuses-electricals-fixings/halfords-socket-cap-screws-m6-x-20mm-hfx253