Am with Origin and can't fault them (so far). Cost for the package you're looking for would be around £30.
They only have a small footprint but use other LLUs if you're outside their catchment area (mine's via Vodafone but the T&Cs are as per Origin's policy). If you contact them pre placing the order they will let you know who it would be so you can decide whether it's right for you and / or whether there are any advantages or disadvantages. TBH, using Vodafone's LLU was quite appealing to me however, I may have re-consider if they had quoted something else!
I quite liked the look of them as:-No download limits
No fair usage policy
No traffic shaping
No blocked sites
We've made it known from the very beginning that we won't block websites or filter any content, unless obligated by law. For parents concerned about their children, there is plenty of free, easy-to-use software available which offers you a more reliable way to control what you see online than any service provider ever could.
For me, all the above is true - no change in speed at any time, irrespective of what I'm doing
and nothing is blocked
There's also no connection charge and you can also use your own modem/router. They sent me a ASUS DSL-N16 which had been preset up, however, they also included a summary with all the info needed to use my own equipment. I run a HG612 and ASUS RT-AC68U.
Happy to share more info if you need it as I queried numerous things with them, for example they will, at your request and assuming your line will support, change your profile