You are very correct in all these things, except that the chance of an evil dictatorship/refugee status being applied to British citizens is pretty hard to imaginewidebody50:Well, you ARE HERE, aren't you??? I am all too familiar with "La Migra". as it is known here in SoCal. My wife is from Mexico, and we had a devil of a time getting her permanent resident status. Fortunately, all is well now.
On the other hand, coming here legally, and expecting to stay and work, well, it does become much more difficult, just as in most other countries. Just do what many people do...come in on a visitor visa, and work under the table until the government offers another amnesty program. With GW in the White House, anything could happen.

Does this wonder BC have water retaining pockets for when you need extra weightswidebody50:Thanks H2...now I can buy that new BC I've been drooling over!!!

Andy, one further question regarding the initial question, what kind of conversation brought you guys to the point of discussing this? The only thing i can recall of using water bottles to change buoyancy was to do with the early cave divers prior to any commercial BC being invented, using the water bottles filled with air to keep them somewhat neutral - was this the genesis of the whole discussion?