You can start a business with no money, but that doesn't mean you can start any business with no money usually people are refering to businesses where they sell their own labour as a service, like consulting, accounting, gardening/landscaping, or cleaning etc. Those can have very little start up costs as you are either working from home or at a clients place, likely already own most of the needed tools, and don't need to keep stock/inventory.
To run a bookshop cafe you would need to rent a premise, plus pay the utilities, do food hygiene compliance, buy kitchen equipment (industrial grade stuff is very expensive), have enough food and drink stock in order to serve people, a point of sales/ordering system, tables and chairs, shelves, and then the actual books.
And then there is marketing, which can cost an absolute fortune if you don't know what you are doing.
An independent bookshop usually takes 12-18 months to start turning a profit, so you would need enough to cover buying all the initial items, plus 18 months worth of rent and utilities (consumer prices for gas/electric are heavily subsidised Vs retail so it will cost a lot more than you expect). Oh and enough to restock what you do sell and replace expired food/drinks.
Depending on location you are probably going to need somewhere around £250k. And it's still a gamble, even if you had the money and did everything perfectly there is still a decent chance the business will fail and you lose it all.