The speed of VM packages is usually 10% ahead of the "headline" value, so that's a good sign. Regarding the BQM, that won't be affected by a wireless connection, because it is testing the connection between Thinkbroadband's servers and your hub, and is a really good tool - set one up, let it run for 24-48 hours see what it says. Your domestic wifi doesn't have any part in the BQM testing, so that's good.
As some guidance, your minimum latency on a VM cable connection (ignoring wifi) will be about 17-23ms. Your average latency will be about 19-25ms, and you'll have peaks from 30-50ms on a good connection, 30-70 on a mediocre connection. And although the BQM doesn't show it, you need to allow for your wifi latency - in my case that seems to add about 13ms average. Openreach connections tend to a be a tiny bit better (say 4ms lower minimum and average, and vastly lower peaking).
But in all of this, remember that your screen to mouse to server round trip time is around 250ms.
