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The benefits of knowing people in your area and having their trust.
Been going to the same few food shops in my area all my life. Anytime I needed a pizza or kebab and I forgot the money I just returned the next day to pay. But no tips we don't do that in England.It happens to the best of us. It is not as bad in the UK, as is in the US, where not having money is worse than death sentence for the average Yankee.
In my case, I realised I did not have my wallet with me in the midst of the meal, and quickly improvised. Of course, this was a frequent haunt, where I knew the owner and staff, so I just got up, spoke with the owner, briefing him as to the predicament, and he said 'it was on the house'. I still took slip, came back the next day, and settled the bill with a large tip.
Postscript:
What happened a few times was where I would dash out of the office, just finishing a meeting, and thinking of the next one, head out, order the food, and then realise I left my wallet behind, but 'cos there are the same restaurants, where they know me, I just return the next day to pay.
The benefits of knowing people in your area and having their trust.