for once get something for nothing out of ken livingstones congestion charge. the lovely mayor of london is offering you all a free car tax disc holder all you got to do is fill in the form on www.cclondon.com
I ordered one but had it sent to the wife. Knowing Ken all the info goes straight to MI5 or suchlike If I see any black helicopters hovering I'll let you all know ;)
Sorry for being so dopey, I found it, it's under the title Congestion Charge Reminders where it says click here and you'll be onto the page for the free tax disk holder.
This still appears to be valid. I have just discovered it on the tfl website and ordered a couple of these free tax disc holders. Here's the link in case you can't find it: https://www.tfl.gov.uk/tfl/roadusers...g/default.aspx