Instructions:Voucher code valid until 13th July 2014
To get the 10% discount, use code loyal10 in cart.
Some of the discounts available but there are other items on the site:
Play 1: £152.10
Play 3: £224.10
Play 5: £314.10
Play Bar: £539.10
I've bought from these guys and had no issues.
The code also seems to work for all products on their site so other deals could be had, for instance KEF VENTURA 4 Outside Speakers for £215.10. I'm not sure if this would be honoured as the discount is for Sonos products.