White waltham's club house is precisely that - a club for the use of members which is also available to visiting pilots. The procedure for visiting non-members who have not flown in is very straightforward, you need to be signed in by a member to use the clubhouse; if you go and have a chat with the CFI or the Airfield manager, I'm sure they will be happy to oblige, if they are not too busy and the club-room is not already full.
However, there is no obligation upon them to do this as this is a PRIVATE MEMBERS CLUB.
In terms of epaulettes, I'm afraid you have grasped the wrong end of the stick, here. About a 1/3rd of the pilots based at WW seem to be involved in commercial aviation, in one form or another; the club rule is that if anyone (including the based members) turns up in full regalia, they have to buy a round of drinks. This is a policy designed to firstly to prevent a commercial pilots club-within-a-club atmosphere developing, and to prevent the sky-god-jet-jockeys from getting a bit too self important....
