M A P stood for Model and Allied Publications and was the myHobbystore group about 3 takeovers ago, I also remember the names Argus Specialist Publications and Nexus Special Interests being publishers of Model Boats and other modelling titles over the years. M A P sold modellers Public Liability Insurance through the magazines until, if memory serves, a previous government introduced legislation that meant you had to be registered as an insurance broker to sell insurance policies, and obviously it was not worth the hassle or the expense for a small specialist publisher.
Currently I use an insurance broker called Walker Midgley who advertise in the modelling press and also have a stand at various modelling shows. They sell a policy from Royal and Sun Alliance called 'Select Insurance Cover for Individual Modellers & Model Engineers', which does what it says on the tin, offering Public Liability Insurance, and also cover for models and workshop equipment, if required.