I found this with a cursory search...
F06 Door lock fault
Issue: Washing machine door cannot be opened or closed / when the door is closed the machine the programme will not start.
Advice: If your washing machine door will not close, please check for any obstructions in the door lock.
If the fault still remains then we recommend you call our customer service centre to book an engineer on: 0344 822 4224
Of course - you can call out whoever you wish.
Good Luck..., March 2016