score:6
I'm not entirely sure what you mean by the "connecting flight lounge", however...
Your flight will be considered an "International to International" connection, as you are coming from and going to a country that is outside of the Schengen area that the Netherlands is located in. This means you will be able to spend the time before your flights in the international departure area of the airport, which has all sorts of shops, including food shops.
As you have a UK passport, you will even be allowed passed through immigration and enter the country, at which point you will be able to access any of the shops that are landside, or even hop a train to downtown Amsterdam - although with only 3 hours between flights I wouldn't recommend doing that!
Upvote:-4
I'm afraid this time will be similar. The UK, EU and Russia have different visa support in such occasions for passengers support Schiphol has the connecting lounge (you don't to pay or trouble about visa).
But if you want to visit things outside this area you have to leave it and it is mandatory to have a legal reason to enter EU (like visa or passport from a country who has visa-free status with EU).