They've done ours as well down in Surrey. Replaced the old orangey sodium lights with a much brighter whiter light. Apparently the new ones are much more energy efficient - they probably do use LEDs!
Only problem is they have employed the biggest bunch of cowboys to do the installation. Instead of doing one street and getting it finished, they seem to be all over the place. It took them over 6 months to replace all of them on our street (14 lamp posts), but next street along they are still a mix of old working, new working and new not connected up. Oh, and when they did do ours rather than taking the rubbish from digging the holes away, they just dumped it in our local nature reserve. Charming.