https://www.mvcr.cz/mvcren/article/coronavirus-information-o...

There is a map with green, orange and green countries.

UK and Sweden are red, most of western Europe orange.

For green countries, Czech citizens can go there and back without the need to present negative tests results and enter quarantine. Same thing for residents and nationals of those countries.

For orange countries, Czech citizens can go there and back without the need to present negative tests results and enter quarantine. Residents and nationals of those countries are banned from entering Czech Republic.

For red countries, Czech citizens can go there but need to present negative tests results and enter quarantine. Residents and nationals of those countries are banned from entering Czech Republic.

Possibly for most, but for New Zealand and Australia it looks ok.