Hi Gaynor
Congratulations on the new job! Although you're not ex-BA I'm guessing you're ex-airline and seem to have identified one of the biggest differences already in that you're usually on your own in terms of on board service. Some people prefer it and some don't.
Don't be put off by the "negativity"*. It's purely that the advertised salary is very low by comparison with other companies (unless it's topped up in some way). You ask if there's any flight pay and I don't mean to be rude but was that not covered in the interview? Per diems in this part of the industry are typically paid on top of any salary, range from £45 to £100 per day and are not taxable. Any expenses incurred in the course of your duties should of course be refundable or the norm would be to have a company credit card.
Good luck. Hope the new job goes well.
(*I have no problem with Bluestream. Nice chaps when I met them, they just couldn't afford me.)