Very good price for this mattress. Can't be beaten, according to Google: https://www.google.co.uk/search?hl=en&tbm=shop&q=Silentnight+Essentials+Pocket+1000+Mattress&oq=Silentnight+Essentials+Pocket+1000+Mattress&gs_l=products-cc.3...1316.1316.0.1622.214.171.124.0.0.0.0.0..0.0...0.0...1ac.
Have you got a link to this?
There are lots on eBay at better prices than this. One seller has a 1000 pocket spring double mattress for £99.99 delivered - though that one is a fairly thin one ( but to be fair you only sink into a mattress a few inches so this isn't a major concern) . There are also many 1400 sprung models under £180 delivered. I personally would stay away from ones with memory foam. My current mattress is foam and I can't wait to change back to just pocket sprung - they are far better.
Fantastic price! Been looking around for weeks for a decent offer on pocket sprung. Ordered yesterday and just received it :)
This is a good price for Pocket sprung and the minimum springs should be 800,so all good.