Again, for clarity, the UK government does not have a duty of care to citizens abroad.
That is very clearly stated here:
https://www.gov.uk/guidance/how-to-deal-with-a-crisis-overseas
It is not a legal obligation of statehood that the government assists a citizen when abroad.
They might feel a moral obligation. They may feel a political incentive to. But there is no legal obligation to.
What they do have is a duty of care to their employees - so, for example, they aren't going to send diplomatic staff into a dangerous position to help some citizens.
The duty of care is to their employees so sending them into danger is a legal problem for them. The citizens are not.
I'm not saying they shouldn't help in this situation, just pointing out that there is no legal obligation for them to do so.
Although realistically, beyond signposting people to information, there isn't a huge amount they can practically do right now.
Even if they were offering flights from Dubai airport right now, I'm not sure I'd get on one given the risk of having a missile or drone flown at it.
Sitting tight at home seems like the best advice for Dubai migrants right now.