Has everybody finished? I found this one hard to get started (other than the obvious10a) but not too difficult once I'd got a few words in. 12a was my last, apart from the following - I'd forgotten about
that Clegg!
Could someone please explain the parsing of 17d? The pioneer is obvious, but I can't see the Spanish connection. Is the clue ambiguous: -ene, -ine and -yne endings all give petroleum derivatives.
TIA
Andy