Prophead - I accept only that TfL can do their sums. But if you're suggesting that I think spending that amount on access works is OK then you are mistaken. Meanwhile, £17Bn + £20Bn = £37Bn. I used £30Bn. Looks like I chose a lower number for my "highly biased" argument. On your second point about getting better value away from areas with the highest real estate prices I agree. Hence why I suggest Stansted as a great alternative choice, especially since it specialises in the highest growth no-frills sector.