(Agree that FERN LAND at 36a is two words, but I guess that’s minor.)

Spotted that the ACORN clashes were immediately under each growing OAK shortly after identifying two or three of the latter, which helped me with the run-in.

And as you might expect, 29d’s clue for ANDRE gives me ache – will I have to become conversant with Hello or move in with someone that is? (How long before Perroncel or Bridge are referenced by Terry?)

If it’s of interest, the Q substitution was devised to get over the practical problem of entering five letters in a single square for the solution diagram. And you’d have needed a magnifying glass to read them anyway!