The population of rats in the UK is one the rise and is currently estimated to be around 150 million, the highest number ever.
Warning over rats invading UK homes
The rats are capable of treading water for up to three days meaning water pipes make for a warm spot to stay and even reproduce.
Mr Heland told The Daily Star: “I have had more callouts than ever from homeowners who have heard a noise, looked down into their toilet only to find a giant rat.
“No one is safe. Rats are excellent swimmers with bendy bones and can squeeze into the smallest of spaces.
“They can hold their breath for three minutes and tread water for three days, and they are coming up waste pipes.
“They’re cunning and getting bolder and bolder. Basically, if they want to get into your home, they will.”
He added: “People are scared and they should be. There are more rats than ever and they are taking over. I have seen some the size of cats.”