Bandwidth 5 to 10Mb/s.
The lowest I can see is 50Mb/s and with anytime calls is twice what I'm paying now.
If making unlimited outbound phonecalls is important to you, you may find it more cost-effective to use your mobile for that. There are packages with unlimited calls at under £5: e.g. Lebara £4.90 with unlimited minutes and 3GB data (via
MSE referral link). Even if you don't have good mobile coverage, most modern phones and networks will do wifi calling.
Decoupling your voice use from your broadband service will make it much easier to swap providers going forwards, especially when you consider that by 2025 the analogue phone network will be switched off. Soon you'll be forced to plug your phone into your broadband router anyway.
Moving your phone number to a VOIP provider lets you receive calls independent from your broadband. Sipgate has zero monthly fees when used as PAYG, although if you want an unlimited calls package that's £9.95 per month - hence why using the mobile for outbound calls is likely to be more cost-effective. Other VOIP providers are available.