Conchobarre’s review published on Letterboxd:
The Lair of the White Worm is ridiculous and not the slightest bit scary. But it's fun and it has my secret Grandpa crush, Peter Capaldi who is practically a baby here. He plays a nerdy, bagpipe playing archaeologist. It also has baby Hugh Grant playing a Landed Toff (of course!) and the menfolk do a fine job doing exactly what their role is in these films, with some astoundingly erudite and specific mystery solving skills thrown in. Their banter is delightful. I thought the grossest part was when Peter Capaldi sucked half a tumbler of puss coloured magical snake venom from someone's throat and spat it out - which is fine, but he didn't even rinse his mouth.
Maybe it's meant to be a black comedy parodying the horror genre. This would explain the truly dreadful makeup and special effects. Some of the sequences are whoop-worthy, they're so outlandishly kitsch. But quite honestly I don't know what it's "supposed" to be. I definitely recommend The Lair of the White Worm because...it's weird. That's enough of a reason.