So, Now came back to me today saying that they are having issues with blocked IPs at their end. A couple of hours later I was told that my IP has been unblocked and all should be well. I was also given a free month entertainment voucher as compensation. Tested and all working as before.
As so many other VM customers are affected I suspect that somehow the VM ISP gateway server addresses have been blocked.
At least there is light at the end of the tunnel for those that are still frustrated by this...