Christmas box 
noun British
A present given at Christmas to tradespeople and employees.In what the Herald described as ‘Lord Hothfield's Christmas box to the town ’, the owner of Skipton Castle, agreed to allow land behind the town hall to be used for a cattle market....
- I give the postman and the window cleaner a Christmas box, and occasionally put some money in it too.
- Lower down, bonuses are more likely to be double the salary - but with many people earning six-figure salaries in this business, that should have made a very nice Christmas box.