I just thought I'd mention this as these bags are often discussed on S&B. I got one yesterday in House of Fraser with 20% off. All sizes and about five colours. I later saw the same deal in John Lewis, again all sizes and about six colours, they had a teal that wasn't in HoF. The bags aren't often discounted so I thought I'd share.
The Longchamp planetes tote I bought with 20% discount from Selfridges just arrived and I absolutely love it! It looked quite small when I first unwrapped it, but then I tried transferring the stuff from the bag I'm currently using and it all fitted in fine. So happy