• Glad you're ok, but if in any doubt at all, do get yourself checked out. Unless I am misunderstanding, you would have had priority as a vehicle wanting to make that manoeuvre - crossing the other section of the carriageway - would have had to wait for it to become clear before doing so.
    The Highway Code states re right turns:
    Rule 180

    Wait until there is a safe gap between you and any oncoming vehicle. Watch out for cyclists, motorcyclists, pedestrians and other road users. Check your mirrors and blind spot again to make sure you are not being overtaken, then make the turn. Do not cut the corner. Take great care when turning into a main road; you will need to watch for traffic in both directions and wait for a safe gap.

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