Here are a few Apps for use with various SmartPhone and Tablet devices around the UK. 

London and Edinburgh -  Timeline Trip - Free apps

Apps for Travelling the UK

Essential Travel Apps for iPhones 

Conde Nast ~ Traveller Magazine ~ iPad iPhone 

Discover Britain Magazine ~ iPhone iPad 

Budget Traveller ~ 20 Best Free Travel Apps for UK 

LoungeBuddy ~ Find Airport Lounges in the UK ~ IPhone & Android

VoiceMap ~ GPS audio walking tours by locals ~ iPhone & Android

 

National Rail Enquiries for Android and iPhone  

Heathrow Airport Guide ~ Mobile Apps 

Wales ~ Archaeological Treasures App 

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Inside London Topic:- Phone Apps for London