Luke Osborne, 27, and his partner Keyleigh Rawlings, 23, caught a Royal Mail worker in the act of leaving a liquid letter on their doorstep, not exactly the type of delivery one expects, or wants.

The Mirror states that the couple thought drunks were to blame for the puddles but when they began to suspect the postie, Luke hid in the hall to catch him in the act.

Luke said: “When I went out, there he was, full frontal, urinating. I couldn’t believe it.”

Royal Mail investigated and said the postman would be dealt with.

Disgusted Luke, of Exeter, Devon, said: “For months my partner and I have been having to walk through urine. "The entrance to our flat is secluded with steps up to the front door.

“I had thought at first it might be late night drunks, but drunks don’t return to the same spot day after day to relieve themselves.

This is the Royal Mail, they deliver in the Queen’s name and there he was having a wee on my front step.”

Royal Mail spokeswoman Val Bodden said: “Royal Mail expects the highest standards of behaviour from our people while out on deliveries and this individual will now face internal disciplinary measures.”