Firstly, BI do not have any A340s in the fleet. It belongs to Sultan Haji Hassanal Bolkiah Mu'izzaddin Waddaulah, and he merely operates it in BI colours. In fact, I am not even sure if the A340 is still operated by Sultan Bolkiah. BI has 8 767-300s and 2 757-200s. The Fokker 70s have now been withdrawn from use.
Secondly, BI is a dry airline; meaning that they do not serve alcohol on board, although you are allowed to bring your own on board and drink that. The flight attendants, will even supply you with mixers and ice.
The service is great. I flew them some years ago from Perth-Bandar Seri Begawan-Singapore (the fare was actually cheaper than flying SQ or QF direct PER-SIN). The flight attendants are amongst the friendliest in the sky, and are only too happy to help you with anything you may need; nothing is too much trouble it seems.
The aircraft are actually the Sultan's aircraft and BI 'borrows' them. The aircraft I flew was one of their 767-300s. Being on an interline ticket at the time, I was upgraded into First Class. I am not sure whether all of their fleet are decked out the same, but the bathrooms has gold plating everywhere (just proof of the money that the Sultan has at his disposal).
I am not sure about PTV. It may be something that the Sultan has put 'a few' dollars into, but it was some time ago when I flew BI.
If you are thinking of flying them from Europe to Australia, or wherever, I really do recommend staying a few days in Brunei. BSB is so small you can walk from one edge of the city to the other in a matter of minutes. One sight not to be missed is Kampong Ayer in BSB. It is like a city in it's self, built on stilts over the water. I think about 20,000 people live there, they have schools, cinemas, shops, everything you can imagine, in K.A. and it is all built over the water.
The Sultan's Palace and the Omar Ali Saifuddin Mosque really are beautiful (gold, of course), and if you are there the right time of year, I think people are able to tour through the palace. There is also Jerudong Park, which is an amusement park which the Sultan built for the people...best thing is....it is all free!!
I must say that the Sultan really loves his people, and this shows with your first experience of Bruneian hospitality, and I would recommend to anyone thinking of flying from Europe to Australia, or vice versa, to give BI a go.