Best move from BT Broadband?

Hi,
I'm currently with BT and paying £36 pcm for 56Mb broadband.
I went with them for convenience when I moved into my new home but now it's approaching 18 months and they've contacted me to discuss renewals...
Their renewal off is - 18 months at exactly the same price.
I've not spoken to them but have chatted online and they're pretty inflexible which is annoying when I see that if I was a new customer I could (through Quidco) get a free 43" 4k tv or an X-Box PLUS £130 cashback for the same price including BT Sport!
I'm pretty much decided that I'll just move because it feels like a rip off tbh... But who out there is good? Who is best? I'd love to save a tenner per month so am looking for something around £25ish pcm.
Any suggestions?
Thanks x