Recently got a second-hand washing machine, upon running through a test wash, the Hot water ran , but never shut off which could have flooded the area.

A washing machine has two inlet valves, one for the hot water and one for cold water. The water inlets on this obviously fails to closed position when shut off ( or it would of started to fill up when I turned the tap on ) but the electronics could not shut the valve to off when needed to only let a certain amount of water in. 

You can swap inlet valves yourself with a screwdriver and pliers and they cost around 20USD delivered, you can find them on eBay for the right model Make sure you get the right one , hot and cold water inlets are different