It is correct to say that the jets must those designed for use with bottled gas. The size of the jet is normally stamped on the side of the jet and the sizes required for Natural or bottled gas should be noted in the cooker information leaflet. As stated in other posts a cooker supplier should be able to tell you the required size and supply the correct ones.
So far as the correct type of gas is concerned my researches have found that only autogas is available in BG, which is a mixture of Butane and Propane, but while I believe this information is correct I have been unable to get official confirmation. The colour of the bottle is not relevant in BG.
Remember that when in the bottle the gas is in liquid form and therefore performs as a liquid and not a gas. So do not fill the bottles totally and always store and use them in the upright position.
With regard to reducing static electricity, avoid clothes made with man made fibres and earth your body to a metal post or similar that goes well into the ground. Metal water pipes for instance. Out in the open air the gas concentration is very unlikely to be explosive, but without seeing the situation I cannot say that is absolutely certain. However even a slight breeze should disperse the gas effectively.
The bottles contain gas at a very high pressure and should be checked at the manufacturers specified intervals. The safest way to do this is to buy ready filled bottles that are available at many garages. You pay for the cylinder once only and then return the bottle for a ready filled one for the cost of the gas supplied.