I'm not sure if this supercedes any of the other Boden deals on here but they've got 10% off their summer clothes till 15th May (plus free returns if needed).
There's a sale page off the main page with deals on previous seasons stuff too.
"This offer is valid until 11.59pm on 15th May 2007, is not for re-sale or publication and can be used once only. This offer is not valid in conjunction with any other Boden, Mini Boden or internet offer. Free returns applies only to deliveries within the UK. Boden gift vouchers and sale items are excluded from this offer."