Your construction don't fit you aim to say they have reached UK. Anonymous They would have been reached UK Wrong. Passive form here is out of place.
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AnonymousThey would have been reached UKWrong. Passive form here is out of place.
Anonymous2) They would have reached UKIt means they was able to reach UK but they didn't.
AnonymousI want to express that "by now they have reached UK" but I am not sureIf you're sure:about the fact thatif they have reached it or not.