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Hi, I'm Lea
I am sorry to hear of your dilemma. Did your wife take the children with your consent? How long has she been gone?
The following is useful info to assist you with the site:
I am afraid that being in Tier 4 means you must stay home, unless you are permitted to travel for work purposes; sharing care of children would appear to be included in reasons to travel, but it's not actually clear. If you did travel, you'd need to self-isolate at both ends of your journey, in the CR and in the UK.
Travel advice for the CR is here: https://www.gov.uk/foreign-travel-advice/czech-republic It would appear that the CR permit entry for family reasons, which your situation falls into, but there are entry requirements, see here: https://www.gov.uk/foreign-travel-advice/czech-republic/entry-requirements
All the information on travelling to and from CR is in the links I provided.
You're very welcome.
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