Her Ladyship's Guide to the Queen's English

Appendix, crisis and thesis come from Latin; the plurals are appendices, crises and theses,

Phenomenon and criterion come from Greek; the plurals are phenomena and criteria.

tea is a drink taken at any time of day, or accompanied by scones, cake and the like in mid-afternoon. (

Dinner is eaten at night, or by dogs;

Lunch is the U term for the meal eaten in the middle of the day

light meal in the evening is supper,

The novelist Nancy Mitford, whose own upper-class pedigree was impeccable, took up the subject in an essay on the English aristocracy (the two essays, along with several others on the same theme, were published in 1956 under the title

Yours faithfully if the letter began Dear Sir or Madam
Yours sincerely if it began Dear Mr Lewis or Dear Amanda Lewis
In both cases, the signature should be a full name, not merely a given name.
In less formal correspondence, more flexibility is permitted:
With best wishes or
Yours
followed by one’s given name will fit most situations

Dear Sir or Madam is appropriate in business correspondence when one does not know the name of the recipient.
Dear Mr (or Mrs, Ms, Miss, according to the preference of the woman concerned) Lewis is the formal way of addressing someone with whom one is not acquainted, whether in a business or a social context. It is also the most courteous way of addressing an older person. If the woman’s preference is not known, use Ms.

In the Roman Catholic Church, the Pope is Your Holiness, a cardinal Your Eminence or Cardinal, an Archbishop Your Grace or Archbishop and a bishop My Lord or Bishop.