I (not GP but also native BrE) reckon I use ~lled transitively and ~lt intransitively. I'm not aware of/haven't found anything to make a case for that though.

(Edit: or perhaps it's more about active/passive voice? Thinking particularly about burnt/burned.)

It's taken to an extreme by some thicker accented (dialected?) people around where I grew up though - an' so I turnt [turned] round (right-right round) an' said to 'im [...]!

Har, this reminds me of an old bit that nicely distills both the mindset and spelling differences across the pond.

UK native, upon seeing the word "color" thinks: "Aha, US spelling!"

US native, upon seeing the word "colour" thinks: "Aha, a typo!"