Move a nest from roof into a hive?

[NewBee79]

I'm pretty sure we have honey bees nesting in our roof. Is there anyway to get them to move into the new TBH I built? Rather that than pay for a nuc as we live next to a crop field and it's possible pesticides could affect them, especially as I believe the moratorium on neo-nics has been dropped.

Any help or suggestions are welcome. Don't think there's more than a couple of hundred of them as the space they're in is pretty small.

Thanks

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[Obee1]

What a beautiful tbh.
How long do you think the bees have been in your roof? And is access possible?