You can say that about any lamp or fitting now days, unfortunately but still cheeper to run, I have 2 Steinel fittings and both working fine for over 3 years.
http://www.steinel.de/Sensor-Switched-Floodlights/oxid-oxid/110019309.html
You don't need to comply with part L as its an existing light fitting but you do need to think of your wallet,
LED has a better lamp life and lower running costs with a longer guarantee.
The LED hut have some good deals!
www.ledhut.co.uk
Good on you sir, not one electrican can really support part P it's a glorified tax and we all know it! (If a plumber (boiler wireing) or window fitter (solar PV)can get a small part of Part P it's a joke)
If you feel confident doing the work then you can do it in your OWN home, if you are...