Routing to a level3 ISP I have an office in in the states peers with London15.Level3.net
No problem to my Cogent ISP in the states, although we don't peer directly with Cogent, that bounces via Telia
Going east from London, a 10 second outage at 12:28:42 GMT on a route that runs from me, level3, tata in India, but no rerouting.