After all the drama of Siavash's £10,000 clothes exchange and Marcus's verbal exchange and refusal of a £15,000 offer, the housemates couldn't wait to see what Big Brother had waiting for them next

"This is Big Brother the Storeroom is now open for housemates to collect their shopping," announced a familiar voice.

"Hurrah," squealed Sophie.

But as they entered the room there was as bit of a surprise which drew a huge gasp from David.

"Twenty grand?" mouthed Sophie as she joined him in the Storeroom where he was holding a gigantic cheque in the air.

Lisa had it sussed straight away. "They've given the mystery prize as £20,000, as well as Siavash's innit," she crowed.

"It's a good idea," said David as he put the cheque down and got on with the important task of making sure all the food had been delivered.

"It's ******* ****," said Marcus characteristically.

"Wow, look at that" sighed a happy-looking Lisa.

But Marcus soon realised that Lisa and David needed to brush up on their maths skills

"It's £20, not £20,000," he said with a hint of sarcasm.

There was a moment of utter silence, before David screeched with laughter. "It's what?" he howled. "I thought it was £20,000."

There'd need to be a few more zeroes David