OK, so if you're offended by the very existence of these, this isn't the thread for you.

I thought I'd start this thread for those who use a vape or any other kind of e-cigarette so that we can keep track of where these can (legally) be used indoors.

Please feel free to add / update with any info you have.

London Heathrow - permitted anywhere within terminal buildings except beyond gate areas (source: HAL) Am assuming that most / all airline lounges don't allow them to be used.

London Gatwick - permitted only in outdoor smoking areas - treated the same as regular cigarettes. (Source: GAL)