Pegasus Birthday discount!

[ozankoys]

My husband's birthday was on Wednesday & today I booked tickets for our November trip to UK. Imagine my surprise when booking his one (we are both Pegasus Plus members) that I was offered a 'Birthday Campaign 20%' box to check! Sure enough his ticket was discounted by 20% so this is worth remembering in future.
Of course I have no idea how many days beyond the birthday this applies to & if the discount would have applied to other tickets on the same booking?