When is it correct to use the word and the symbol &?When going through a text I had typed, my sister informed me that one should never put the & symbol. Instead, the word 'and' should always be put in sentences which are for formal text. She said that the & symbol is Ok to use in informal communications, say, with a friend, and in the name of a company, such as L&T. Frankly, I never knew this! I have been merrily using the symbol as a kind of shortcut instead of typing out the three letter word.
I would like some more details on this as I do use the symbol when submitting a job, where, for example:
1. Finance & Accounts vacancies.
2. F&B assistants (for a job vacancy for the food and beverage department in a hotel.)
3. Business development & Administrative managers are required.
In the above examples, as per English grammar, is it correct to use the symbol?
Secondly, should the word immediately after the symbol always begin with a capital letter? Are there any exceptions to the rule?
Thirdly, should there be no space before and after the symbol in the case of examples like the second one above, where only single letters are there?
Can members give their input on this? Please don't give me information from the Net, but give guidance as per your own expertise and knowledge.