If you live near one of the Squires Garden Centres around the country, you can head over to their website, pop in your info, and print a voucher for a free slice of cake, no purchase necessary.
The voucher entitles you to one slice of cake free of charge. You can't use it on individual cakes - which I take to mean their whole cakes - muffins, cookies or chocolate bars.
I suppose that they expect no one will turn up and have a slice of cake and leave, but technically you could. Personally, I'd have a cup of coffee too!
This voucher is valid until the 22nd of June, and can't be used with any other offers. You can only use the voucher once per person, at any Squire's Cafe Bar. (Those are in Badshot Lea, Cobham, Crawley, Hersham, Long Ditton, Milford, Reigate, Shepperton, Stanmore, Twickenham, Washington, West Horsley, Windsor and Woking).
And I was just there today, buying courgettes. Bummer! I'll have to go back soon.