What should I keep in mind when interviewing for a job that would move me to England?

So, this is still in the early phases, but I had a second meeting today with a company I used to work for about moving into a sales management position for their UK branch. It’s certainly not a huge company and I always worked well with the owner, but it’s a huge opportunity for me.

I’m pretty confident about the sales side of things, and not that worried about cultural angles right now, but I need some help on things to ponder when we start negotiating. Obviously, I want a rock-solid contract for several years. What move-related expenses should I expect the company to pick up? Should they be responsible for securing a work visa? They’ve moved employees from Europe to the States before, but never the other way around.

Should I get paid in dollars or pounds? What about health care as an American in the UK? Obviously my wife and I would have to store a lot of stuff here, can I ask for a signing bonus to cover that kind of expenses?

If you’ve ever moved for work, particularly internationally (American Jellies in Canada or vice-versa), I’d really appreciate any info or suggestions you have for building a contract. Thanks in advance.