Josh fumes as he finds out another Blockhead has stolen his 'game-changing' idea

The twins Josh and Luke are struggling to find their feet with perfecting the finer details that come with styling on The Block.

Bathroom Week is on and Josh came up with a "game-changing" towel idea for their Jack and Jill-style bathroom, but it soon turned into a blow-up with neighbour Mitch.

Stream the latest episodes of The Block for free on 9Now.

"The game-changing towel idea was just putting two different coloured towels in there, one for a guy, one for a girl," he confidently told a producer.

Josh headed off to Aura Home to buy towels and styling items for the bathroom.

He had a limestone green picked out and wanted a pale pink to go with it, but after making the decision the shop assistant had some bad news.

RELATED: Block teams unleash on the judges' feedback during a fiery Open For Inspections

"Unfortunately, there is another Blockhead doing the exact same colour combo," she told Josh.

Yep, the same two towels, which immediately had Josh offside.

"Who were they?" he asked.

The shop assistant replied, "I'm not allowed to say."

It didn't take long for Josh to start naming some suspects. He quickly assumed it was Mitch, because he's a pink kind of man.

"I said, 'Well, I'm just going to have to change the green to a different green and I'll have words with Mitch about this later'," Josh recalled.

"I reckon he might have been listening into conversations."

RELATED: Asbestos discovery on The Block site hits close to home for twins Josh and Luke

Josh was forced to choose another combination for their bathroom, and clearly, he wasn't happy that his "game-changing" idea was stolen.

"I'm a little bit upset, I'm a little bit upset, I'm pretty sure it's Mitch," Josh said.

"So they obviously were eavesdropping on my conversation with Luke last night and they've come in here as soon as this shops open and stolen my colour combination. Sly old Mitchy, he's got a few tricks up his sleeve, the old dog."

But things went from bad to worse when Josh pulled up outside Beacon Lighting, only for Mitch to arrive at the same time.

He went over to Mitch to confront him about the towel saga and Mitch was not impressed at the accusations he and Mark were copying House 4.

You can watch the whole moment in the video above.

The Block airs Sunday at 7.00pm and Monday to Wednesday at 7.30pm on Nine. Catch up on all the latest episodes on 9Now.