It does sound like you are suffering from high utilisation in your area at peak times. However, wireless is easily disrupted by a number of external factors, so a wired test is the only way to get a true picture of what speed your line is able to achieve.
Are you able to try through a wired connection with the Super Hub in modem mode to see if the speed differs? This helps rule out any interference from other devices and will likely be one of the things VM staff will suggest when they get to your post in a few days time.
Disclaimer - I don't work for Virgin Media. I'm just another VM user trying to help out so my answers may be wrong :-) If you do like my answer please mark it as helpful as it may help others My setup: Vivid 200 Optical fibre with Superhub 2 in modem mode connected to a Netgear R7000 router. Telewest/VM user since 2001.
Welcome to the forum. I've had a check on your connection and I can see that there is a fault raised for peak time contention (F002657887). Apologies for any inconvenience this is causing you. If you are able to bump the thread a little nearer to the review date which is estimated for 18/05/2016 we can have a look for any updates on this fault ticket. For the best possible connection when playing online I would also recommend using wired rather than wireless.