I tried and failed
T&C seem to suggest that the £20 can only be used on the first journey only, but i've heard of numerous people being able use if for 2nd/3rd journeys until the £20 limit is hit. Sipls - im an existing customer and managed to add it, ive already had the 11th ride for free, suggest you re-try
So you don't have to use all the £20 in one journey?
Seems to be for new users, wouldn't let me add the code
got this deal myself a few months back and its pretty good. used it once (£10) and forgot about it till i used uber last week, twice for two sub £5 journeys and still automatically got the journeys free. good find and reccommended