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I found FRA to be a confusing building site when I was there.
If going via LHR T5 with lounge access I think that would be a pleasurable way to spend 5 hours...
you missed the point of the OP's question - would he have time to pop out and do things... FRA vs LHR?
Mr!
Ze German Trains DO NOT have delays!leaving airports with only 5 hrs to spare cant be quite dangerous. Train cancellations/delays, security delays etc! ive cut it quite short when ive left a few airports around the place!
funkyr, you don't have much time to leave and be sure to get back as long into city takes at least 50mins one way.
I agree just go to T5 south and relax and enjoy the great choice of food and drink.
Also enjoy the punitive taxes out of the UK.