"Our Think Pick 'n Mix packs just got bigger - for a limited time we are expanding all our packs to 10 cartridges!
Receive up to 4 EXTRA inkjets cartridges with all our Epson compatible Pick 'n Mix Packs - that's now from just £1.99 per cartridge!
You create your pack with the combination of colour's you need, for example, a six pack can be, 2 magenta, 1 cyan, 1 yellow and 2 blacks. Or an all magenta pack if you like."
I ordered 10 for my Brother All-in-one on Tuesday, and got them delivered this morning.
The 10% off voucher is attached, and thanks to OP 'Bigbum' for his/her post - http://www.hotukdeals.com/item/151057/10-of-choice-stationery-forever/
The code for 10% off is SAGA08, and doesn't seem to have an expiry date.