Yeah you can't buy codiene over the counter here, I got a look of horror at the pharmacy when I asked for something like migraleve. Ironically, there was a coffeeshop to doors down, but I was looked at like I was a druggy for asking for codiene. Anyhoo, chemistdirect.co.uk delivers to NL and is quite cheap.
Bring some good extendable stairgates if you can find some in the uk.
You & the kids will need to register with your local council office here which you will need your birth certificates apostilised for, is that the right term ladies. If you are here and they are not done you will need to send them back to the UK to have them done.
The immunization schedule is all the same jabs but on a couple of them they have one extra, so like where in the UK they do 3 HiB here they do 4. When we first arrived my eldest had to catch up to their system and was a pin cushion. It wasn't until after it all that I discovered that if I had registered at the local international GP clinic I could have stuck to the UK system.
Otherwise the baby and child clinics are very good. I was given a Dutch 'groen boek' to replace my DS2's green book, but found out afterwards that they do have the books in English. I think my local clinic (consultatiebureau) wasn't used to dealing with English speaking mums.
We have an over and really really hot water, but our first place that we rented when we arrived had no oven.