Link: http://itunes.apple.com/app/lonely-planet-london-city/id315598273?mt=8
Now Free
OFFLINE MAPS WITH NEIGHBOURHOODS (no data roaming)
INTERACTIVE MAP FEATURES (may require data roaming in dense areas)
HUNDREDS OF RECOMMENDED PLACES TO VISIT & THINGS TO DO
EASY NAVIGATION TO QUICKLY FIND THE INFO YOU NEED
EDITORIAL CITY GUIDE CONTENT FROM OUR AUTHORS
PROFESSIONAL LONELY PLANET IMAGES