Normal price £15/month
Get 25% off as existing customer reduces the price to £11.25
use £3 off code: 3MBB3OFF to reduce the price to £8.25
Topcashback tracked £48
Possible RAF of 2x£15 between you and family member
So potentially less than £4/month for 5GB mobile broadband
All other competitors £15 for 3GB data.
Especially useful for anyone without BT or Virgin landline
The procedure to get £8.25 is in post #22.
This looks like a glitch and I am not sure people can get it. I have post my experience in post #30.