Another non-reader of my blog outed
http://headforpoints.com/2012/10/28/...ink-cartridge/ tells you a lot of what you need to know
For a job lot, instead of using Tesco envelopes stick them in a box and send to:
Freepost RSKX-GUZZ-URKY
Tesco Cancer Research UK
The Recycling Factory
Boston
PE21 7TX
With, of course, your CC details and the fact you want all points, not a 50 50 charity split.