Agreed FWL for peace of mind you could use a pat tester but in an official capacity in making reports i feel that the use of an approved tester with current calibration cerificate to validate the tests , should be used, so if the Aforementioned "appliance" is indeed a portable appliance then use a pat tester otherwise treat it as part of an installation and apply the installation tests in accordance with IEE Regs.
Kendor, your post ended with a comment about bleeting, I agree that is what you did. Your entire post tells me that you have read a few things today, and not understood a bean about any of it.
In this situation the Electricity at Work Act plays absolutely no part, and the IEE does no express an opinion on domestically owned appliances being PAT tested, so why you have seen fit to mention any of this escapes me.
If you truly understood anything about what you have been bleeting on about, you would know that an appliance or piece of electrical equipment which is not part of the installation has two classifications, they are either Portable equipment or Fixed (static) equipment.
In the case of the light fitting, it would be classed as fixed equipment, and there are set guidelines for testing said euipment. Under these guidelines fixed equipment is to be treated as seperate from the Installation as thus tested independently. Further, so long as adequate precautions are taken to avoid danger to persons or damage to the equipment, a PAT tester may be used to verify the safety of the equipment, or any other accepted tester which can perform the accepted tests.
Regarding calibrated equipment, all contractors test equipment should be re-calibrated annually, if it is not then the results are meaningless as they cannot be relied upon. This is also true should an instrument recieve a substantial impact, such as being dropped from more that 600mm.