I've read stuff on the internet about ink Jet Cartridges in hand luggage and frankly it's really confusing. Some says you can take them, others say you can't. I've searched various airlines, looking for advice and it is distinctly missing!

So, here is my experience. 

I returned to the UK on Monday (brief 47 hour visit), with five empty ink cartridges in my liquids bag (I wanted to take them back to recycle them to HP, who kindly supply a post paid bag).  Cleared security with no questions