Simon built the fantastic mouse village, which has pubs and a bookshop, after one of his wildlife photographs went viral - viral videos of the week.
Watch Callum order the UK's most expensive cookie, for an eye-watering price, which he felt was raw and tasted like sand - saying he prefers Tesco cookies.
Supermarkets are adjusting their hours for the final - in case employees need an extra hour on Monday 🌟
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