I'm actually in UK and funny enough this is the only site not showing me prices in gbp.. I shop from online sites all the time.
Doesn't work for me with "APP10" code, I have more than £50 in my basket. It only gives me express/nominated delivery free.
I used PC last night, took 10% off sale items, select express/nominated delivery
I think it only works from the app.
10% code didn’t work on sale items for me 😞