I was in Chester around 17:35, the London service was cancelled only going as far as Crewe, then returning to Chester. At Crewe all Virgin services were running at least 45minutes late with extra stops being added on some services.
When I got back to Birmingham two Euston services were cancelled aswell as the Glasgow/Edinburgh services.
We were told that there was a signalling failure at Harrow and Wealdstone and no trains would be going in or out of Euston.