According to the
Daily Mail there's a loophole:
"..the legislation refers only to 'household bulbs' and does not cover the near-identical traditional bulbs intended for 'industrial use'.
These heavy-duty bulbs look exactly the same as an old-fashioned bulb but are designed to withstand the battering of a building site, mine or factory.
Although they are not available from supermarkets or high-street DIY chains, they can be bought from specialist shops and internet retailers for about £1 each.
They are sold as 'rough-service bulbs' and come in screw and bayonet fittings."