"I ate out on Tuesday and on the menu for starters was A Scotch Egg for £6.50. My local Morrison's sell 4 Scotch Eggs for £1.75."
My suggestion is to pop down to Morrison's and buy four. Then you and your three fellow diners can pop back to the restaurant and ask them if you could sit in there and eat them. Find out first how much they would like you to contribute to their rent, rates, heating, lighting, cleaning, maintenance, water rates, staff costs (including pay, employers' NI contributions, pension contributions, sick pay and holiday pay) and a few more things besides.