I've just taken over the running of a community building which is single phase and is no more complex than a large 4-bedroomed bungalow in terms of space, load and number of socket outlets. The electrical test electrician currently conducting the test is qualified for single phase only. The new insurance company specifies the tester must be qualified for 3-phase. While they have a right to do this, is it reasonable and based upon a real need? Can I contest it and on what technical basis?