Travelling by London Underground during this hot weather? You might find this new TFL app - designed by @TechnicallyRon - useful...
![](https://img.huffingtonpost.com/asset/5d023fa4210000dc18eeeb99.jpeg?ops=scalefit_720_noupscale)
Travelling by London Underground during this hot weather? You might find this new TFL app - designed by @TechnicallyRon - useful...