I would be grateful for advice on the correct sequence I should follow to move from an education visa to a Guardian visa (I have a foreign child studying in Thailand).

I have an ED visa valid until 18 June. UK passport.

I will be travelling in April to the UK, and have a re-entry permit. I have all the required finances in place in a Thai bank account to qualify for the guardian visa now. My questions:

* can I apply for the guardian visa on return to Thailand, or could I start the process of applying for it before leaving on 5/4?

* If I need to cancel my ED visa before applying for a guardian visa, when should I do this?

* Would it be better (and is it possible) to apply for the guardian visa in the UK, I would have enough time to do this on my trip.

I am anxious not to jeopardise my return to Thailand in April, I will be travelling with my daughter.

In case relevant, I have held an education visa since August, and have no previous history of Covid related extensions or overstay.

TIA