jdcarpe's suggestion can potentially change your routing tables/transmission route, a similar result to you going on to VPN.
VPN working indicates that it most likely a routing issue. Data that is transmitted from point A (your home) to point B (MK) will travel through various routing points to reach it's destination. If one of those locations is having an issue, this is the result. You could try the "tracert" command in CMD prompt to view the route the packets are taking in real time, but based on a test I just did it looks like this request will be blocked, so no luck there.