For weeks now, I've been unable to get a BT test to complete: http://www.speedtester.bt.com/
No matter what time of day or night I try it, I get 'testing your best effort service for Test 1', Then 'Now testing upstream speed for Test 1'
Sometimes it siezes up at that point, other times it completes 100% then siezes up doing no more, and after a minute I get:
The system is currently busy. Please try again shortly, however if this problem persists, raise the issue with your service provider.
Any reason this is happening?