In two ways, yes.

The main one will be the WBC Node, (there are twenty), that your connection goes through to get to them. The capacity BT Retail rent at each is fixed, (in the short term but can obviously be enhanced), and unless things have changed your connection always goes through the same one except possibly if it goes faulty.

Given that, the load on the twenty nodes can be very different at all times of day. For example, Entanet have links at all twenty as well, and the load on the Entanet links is shown here. (I think it updates every 5 or 10 minutes). That on the BT Retail ones will be different.

Given that a node may be close to capacity at a heavy time, but a different one not so badly affected at that time, and assuming traffic is managed according to the node a user is on, some users could experience severe throttling while most are not affected.

I'm in a similar situation. I pickup 14 wireless networks in range when I scan on my Sony Laptop. My macbook gets about 9.

I was getting full 70Mbps + on wireless. Just last night onwards it's crashed to 35Mbps at best. This is on all channels and all devices. I tried another router but it's not having it.

Looks like in busy areas 2.4ghz is just too packed. I would switch to 5Ghz but I don't want to spend £80 + on a good router.

Ahhh well.

I would switch to 5Ghz but I don't want to spend £80 + on a good router.

Have you checked your devices support 5GHz anyway?

The current router i switched to is doing a bit better im getting about 28-30Mbps i hate granite buildings :/

Thankfully my main pc is right beside the phone socket so i can enjoy cat6 goodness.