Correspondances férroviaires en europe. EUrail map-2011.pdf. Maps of railway-networks. Ferrocarta.net - Railway Maps. Chemins de fer d'Europe et du monde. How to travel by train from London to Europe - a complete guide. There's no need to fly from the UK to anywhere in Europe.
It's surprisingly easy, quick and comfortable to travel overland by train from London to just about anywhere: Spain, Italy, Greece, Prague, Helsinki, Moscow... The difficult bit is finding out how to do it and where to buy tickets.