I've located your account and I can see an issue with the network in your area affecting speeds at peak times - Ref.(F004680483). Our technicians are working to get this resolved and have set a review date of 15th February.
I'm really sorry for any inconvenience this may cause.
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JayG, I'm in the Condorrat area and our speeds are shockingly bad at night as well. It was perfect until mid December then wallop, dreadful at night. I put my SH3 into modem mode this morning, wired it directly to my laptop and got speeds above 200Mb. Going to do the same tonight then report back to them.
It's strange though, i had a Virgin Media tech friend check yesterday and we have no over-utilisation in the area. Are you close-by to me?