Are you testing wired or wireless? Wireless is not always the best and you might have started to clash with a neighbour's channel. Try changing channel.
Hi XRaySpeX, thanks for responding.
I am on a wired connection straight from the bright box router that orange supply, using both laptop and desktop computers.
Stats are in my original post and haven't changed, but latest BT test results are: 0.06 Mbps down and 0.83 up. Ip profile down is 4.01 ip profile up is 0.83.
This surely must be an ISP thing right?