If my memory serves me after all this time, from my involvement on the inter-governmental Safety Commission (courtesy of being in the MoD), principal issues are the fire isolation/smoke containment and the means of passenger egress in the event of a fire underground in the Chunnel.
Like others, I much look forward to an entirely new era in train travel with more direct services from London to a host of continental European destinations.
@ Henkel.Trocken – 15/06/2013 12:43 GMT
I may be wrong but I think that there might be an issue with the train gauge (i.e “size”) of the ICE train. Most continental railways use a larger gauge translating to wider/taller carriage sets. Hence any number of issues around moving larger sea containers to/from Felixstowe and the new London Gateway on the existing UK rail network. That is very possibly why running an ICE over non-HS UK rails may be a pleasant idea but technically impossible.