Huge spikes in latency

Hey, 

Recently switched to virgin media (approx 1 month ago), and I've had the worst WiFi connection I have ever experienced. On a regular basis, I experience 20-40 ms which then shoots up to 700+ms every couple of seconds or so. Its not my location or distance from the router as it does the same no matter where I am, and had never done this before with my previous provider. I Repeatedly do ping tests online to Manchester shown below for proof. Is this a known problem/ have a fix? 

Thanks!