Because I am useless I dropped my driving license in the street yesterday (long story, but it should be in an envelope going somewhere very important, but now it is not)
Amazingly, a very kind lady returned it to my house today, she must have driven at least 5 miles to do so.
I was in the house and the DD's were in the garden selling cut flowers, she gave it to them and bought some flowers 
The license was in an envelope with a note with her name, address and tel no, saying she tried to find my no to call me last night as I must have been worried about it (I wasn't I thought it was in the damn envelope).
I can't really afford to send flowers also she just bought some, would just a phone call to say thank you be enough, or should I drop her around a box of chocs or something?
WWYD?