Definitely go through every cupboard and shelf - inside and out - you do not want to be dragging truckloads of stuff that you don't use or love with you. Take it from me, it's easier to do it at this end than at the other end.

Don't assume you will have a house with the same amount or type of storage as you do now. Things to look for in your new house - a good weatherproof, lockable shed (for overflow if needed) or other storage (underhouse, etc) and be prepared for some temp storage means like plastic crates etc if needed.

Take photos/video of your electronic items (including dryer, washing machine, fridge) working just prior to your uplift. Don't wait until the other end when it's busted and the removals insurance questions whether they were broken before the move!

Definitely organise someone to mind the kids during prepack and uplift - and if you can at all - at the other end as well. If they organise the move for you several men will descend on your house and start packing all at once - you want to have as many eyes as you can so that your bins don't get packed with their rubbish in them (yep has happened before) and that they're using enough paper and not cramming your gear into the truck all wrong. It's not easy to look after kids and supervise the packers at the same time.

Re selling your house - make sure you investigate whether you're better off selling and buying a new house or whether there's a subsidised employee housing scheme that you can take up that makes it more financially rewarding to rent your house out and live in one of theirs. It can make a bit difference over just a few years.