High latency problems with HH5/BT inifinty 2

Hello all!
I'm not really tech savy, so will explain this as best as possible. I'm basically having constantly high latency with it spiking for no reason, even though all my speeds (up and down) are fast and fine. This is also a wired connection running Cata6 cables.
When I first had my internet installed I was running around 18ms constantly. After around 6 months or so, this then increased to around 35ms. Now its normally running around 45ms, with it constantly spiking for no reason what so ever (over 100ms). I've repeatedly reset the router (both through the reset button and just unplugging the power cable). Both my download speeds and upload speeds are both great (will post the test results at the end). I've even restored factory settings.
I've had this latest speed & problem for now around 5 days and I can't clear it with anyway I know how. I called the tech team yesterday and was on the line for over thirty minutes with me explaining the problem to them, but the person on the other end was extremely rude and unhelpful (pretty useless being honest). He reset the router from his end and said there was no problems with it and that BT won't help me any further. He went on to say thats just the internet for you, which I know it isn't. In particular, its mostly affecting my online gaming. I know its nothing to do with the games servers as I house share with a person who's ISP is Virgin Media and they have zero problems playing the same game as me, even though their internet speeds aren't as fast as mine. I know it's not just the system I use. The problem is the same with my laptop, PC, smartphones, PS4 and smart TV.
It's now getting to a point when its becoming pointless having BT installed and its getting near the last straw where I really am just going to cut the service off as its awful.
Does anyone by anychance know how to solve this? If it also helps I live in London, East to be exact.
My speeds are:- Download Speed (Mbps):  73.11
                        Upload Speed (Mbps): 11.63
                        Ping Latency (ms): 43.00
Thanks to anyone that replies.

Forgot to mention that other users of the hub5a have recommeded setting the DCHP to 21 days , which I think is the max to see if that helps?
Although its does sound  like somethings up if its dropping line connnection.
Have you been through the usual checks & tests rigmarole to rule out an openreach vist?
https://www.bt.com/consumerFaultTracking/public/faults/reporting.do?pageId=21
http://www.homeandwork.openreach.co.uk/problems-with-your-phone-or-broadband/search.aspx
17070 quiet line test 
https://support.zen.co.uk/kb/Knowledgebase/Performing-a-Quiet-Line-Test    {How to guide}
Might highlight something thats not the usual hh5a mischief.

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    Hi Guys,
    I agree with Sm3K3R that a 70+ microsecond increase in average DPC latency will have an undesirable affect on some apps (games, real-time streaming, etc.). I also believe that what is good for XP will almost certainly not be good for Windows 7. Too much of the architecture has changed. Better drivers may help going forward. To me, the bigger question is why this mobo takes so much longer to run these routines than the K9A2.
    I do not have any serious problems with the apps I run. Some of them may run better with a shorter average DPC latency. I have no way to tell with what I currently have to work with. Other bottlenecks may be in play. I was just responding to Sm3K3R's request for feedback. My power option is set to high performance and my base configuration has 41 processes running, including Diskeeper real-time defragmenter, Avira Antivirus, Logitech SetPoint, Process Lasso's process governor, PeerBlocker, and TaskDock. It also includes the Microsoft search functions and the sidebar with 2 gadgets running. Most of these processes run as services. I thought it was the search, sidebar, or one or more of the non-Microsoft products causing my base 100+ average latency indicated by the DPC high latency tool, so I ran LatencyMon to find out.
    I ran it several times for 2 to 5 minutes at a time, starting when the system was idle. The Nvidia display and NT Kernel & System drivers always topped the list, with latencies from 50 to 114 microseconds. The display driver's routine also ran much more often than any thing else, followed, about 60% less often, by the NT Kernel & System driver. Thus these 2 drivers contribute the most to my average DPC latency. The other products listed above most often had 0 or less than 15 microsecond DPC latencies. Once I saw this, I did not bother to check my game configuration which does not have the search, sidebar, and the non-Microsoft products listed above in it.
    During a Google search of this issue, I read that someone reduced their average Windows 7 DPC latency by 50 microseconds by turning off the HPET timer. I tried this and it did not work for me.
    Looking forward to the results of Sm3K3R's further testing and feedback from others.

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