Beekeepers and their supporters have protested in Parliament Square to call for the government to support a ban on pesticides linked to the death of bees.
Research suggests that neonicotinoid pesticides have significant adverse affects on the survival rate of bees.
The protest comes ahead of a vote on a European Union proposal to ban the use of the chemicals.
Britain has previously refused to back the ban saying the effect of these chemicals on bees is unclear.
'Finely balanced'
Matt Shardlow, chief executive of nature conservation organisation Buglife, said: "Britain abstained last time and has made no commitment this time, but we want them to support a ban across Europe."
According to Mr Shardlow 73% of the British public support the proposed ban.