Good to know about Concert Hall Approach. I made extensive enquiries, some weeks ago, and Southwark Council does not have facilities for disposal or recycling. The only Tesco to have a collection box is Lewisham. Sainsbury's computer said 'no'.
The Charity shop idea is also a good one - but they need to recycle too, before they get swamped.
'Barmy' comes to mind. I use my Bags For Lifes - simple enough.