Whenever I’m walking down Cornmarket Street in Oxford – an otherwise unlovely thoroughfare – there is something about the spectacle of the enormous Greggs there that gladdens my soul. Compared to all the other overpriced, depressing places that sell lunchtime sandwiches in the area – I popped into Pret the other day and was astonished to be charged a fiver for some measly dried mango and a suspicious can of drink – Greggs is dedicated to giving its customers value for money that isn’t just welcome, but, in these straitened times, feels positively generous.