This is my first post so please be gentle. Also, pay attention!
The price of the monitor is £139 inc VAT + delivery.
Minus 10% quidco cashback (10% before VAT -£11.12) - £127.88.
Minus the £60 cashback from Dell Reward and Recycle (http://www.rewardandrecycle.com/_Content/en-US/qualifying-products.htm) - £67.88
Minus the £10 they will give you towards posting your old monitor - £57.88
I appreciate that £57.88 is the best possible price, considering you'd either have to post it for free (plausable if you work for the right company) or deliver it yourself, however even then it shouldn't cost you more than a few pounds.
Enjoy and get there quick. I bought two of these a couple of weeks ago and they went out of stock pretty quickly!