Does anyone know......

I looked into it for a friend, the speed was low and she wanted a tv package, just to record and pause programmes. Therefore it was not suitable for her.

We live in a semi rural market town, we could only use BT who where fastest for our area, but still not brillliant, but adequate for my needs

Here is the Offcom page on social tariffs www.ofcom.org.uk/phones-telecoms-and-internet/advice-for-consumers/costs-and-billing/social-tariffs . If you scroll down, there is a table showing the speed (and cost) for all providers that offer this, and where they operate.

A few are shockingly low, but most are fine, and some are very fast indeed.

I have this with BT. Was with BT before I went on to their social tariff. I use laptop, have alexa (using wifi).
It made absolutely no difference whatsoever to my wifi or my landline, etc. Made a large difference to my finances and I am so very grateful for it.

Hi Travels yes I have the low cost broadband.
I live alone, dont use a pc or laptop, just my phone and I pad.
I find it does affect the speed, and when I was enquiring for a friend who uses the broadband for his TV channels that there wouldnt be enough signal to support this.
It is adequate, if a but slow for my needs.