I charge £1.10 for six free range eggs - only because they had been £1 for years and I thought 10p extra was not a massive increase. I think £1 is maybe a good idea, as people do tend not to have the right money for other amounts. In fact someone must have only had £5 note for a dozen eggs, so they left that!! Not sure if they ever came back and took their change when there was enough in the tin.