One of our colleagues has been off sick for weeks with stress issues. We all know she doesn't like her job and is planning on moving abroad early next year so the chances of getting her to come back in while she's on full pay are limited. The patience of her hard working colleagues is being tested to the limit as she pops in with her sick note and a cheery wave and smile. To top it all, she's now put her name down for the Christmas do. Is all this legal?