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Vanguard offer short-term bond index funds and you can filter their product list by risk level on their website (https://www.vanguardinvestor.co.uk/what-we-offer/all-products)
3 - 5 years is a short time horizon so I'd be wary of downturns. If you want zero risk but low reward, maybe consider a fixed term bond product?
https://www.moneysavingexpert.com/savings/savings-accounts-best-interest/#fixedsavings
Following on from earlier about putting a whole chunk in premium bonds, is there a suitable low-risk Vanguard fund I can just dump in and set and forget for 3-5 years?
The more I look at the PB calculator it seems pointless