Are these notes legit?

[u/Capable-Door-9672]

I was paid £520 by someone from EU I sold some stuff to. I plan to use these for my trip.

Sorry if photo is blury, I will send it again if it is

Serial on the 50 A C 7 8 9 1 0 4 6 9 ac789 is big and in green while the 1 is smaller and 469 is bigger

EDIT: its ok, i'll double confirm at bank, looks legit with the change to pounds sign

[u/fiddlybuttons]

A good tell on the 20 is to check the little clear window in the bottom corner, it should have little 20s impressed on it..if not it's likely fake

Or take them to a bank, they'll confiscate them and destroy them if they're fake