(Posted in 2 parts):
The answer depends upon exactly what type of licence(s) you have. My local bowls club, for example, doesn't need to have a licensed doorman because they operate under a club registration certificate rather than a justice's on-licence (and they've not got an entertainments licence).
I suspect, however, that (daft as it seems) your social club may well fall foul of the legislation. Even if your alcohol licence is of a type not covered by this legislation, your entertainment licence may well bring your club within its scope.
Here's the official line:
"You need a licence if you are responsible for security, protection, screening the suitability of people entering premises or dealing with conflict in pubs, clubs and other licensed premises open to the public.
Initially only door supervisors working at premises with a justices� on-licence required an SIA licence. However, licensing has now been extended to include other licensed premises such as those with an occasional licence (under the Licensing Act 1964), premises licensed under the Private Places of Entertainment (Licensing Act)1967, and certain premises licensed under Local Government (Miscellaneous Provisions) Act 1982 or the London Government Act 1963.
Anyone carrying out security duties at these licensed premises must have a Door Supervisor licence from 12 September 2005.
Premises covered by other legislation such as private members clubs, guest houses, bingo halls, theatres, cinemas, and licensed premises under the Gaming Act 1968 (casinos for example) will not require licensed staff".