I think it will be presented as an essential business meeting (which was allowed under the regs at the time) and whilst they were all gathered at number 10 anyway what difference would it make if they had a glass of wine and cheese and biscuits at the same time. Presumably it could be argued that they would have had coffee and biscuits during a business meeting anyway? Just playing the devil's advocate here BTW as I wouldn't believe such spin for a moment!