At VS the oxygen servicing is carried out by the avionics guy's (+ gals), although as Spannersatcx points out it can be a pain in the ar*e on a short t/r, try explaining to the crew that you can not board pax due oxy servicing!!
On the subject of UK vs US rules the RAF TriStars could have bottled oxy charged in situ on the ex BA aircraft but on the ex Pan Am the bottle had to be removed.
------------------
"please report further"
[This message has been edited by Penn Doff (edited 18 March 2001).]