Sounds like a retrograde step to me - most EU countries are trying to increase the number of beekeepers (and thus the number of bees), not discourage them by the imposition of taxes !
Suggest you form or join a collective organisation, and lobby your regional MP. Your Euro-MP would also be worth contacting, in view of the EU's position on this issue. Collective voices are always stronger than those of individuals.
An example of the EU's position on beekeeping encouragement can be seen in this 2011 European Parliament report:
On honeybee health and the challenges of the beekeeping sector (2011/2108(INI))
46. Calls on the Commission to consider the possibility of creating a special scheme for assistance to beekeepers within the framework of the direct aid scheme, for example through bee colony payments, which will help safeguard the beekeeping sector in the EU, keep beekeepers in beekeeping, encourage young people to become beekeepers and ensure bees continue to act as pollinators;
Sorry - forgot to answer your question - no taxes of any kind on hives in Britain. However, if any products from the hive are sold (honey, bees, wax etc) then this income is taxable (in theory ...).