This deal is not for everyone as you need to have homecare cover with British Gas. This is not available online.
British Gas engineers are offering £50 discount on hives installed while they are at your property to carry out a repair or service. The normal "in day" price for a hive installed by a British Gas engineers is £199, so £149 now. If you have a faulty control- timer/thermostat the normal "in day" price is £149 so £99 now. In my experience the engineers will be happy to fit you one at the lower price even if your timer/thermostat is not faulty.
As mentioned i know this deal is not for everyone, but if you do have homecare it's the cheapest way to get yourself a hive.