Which size Snag tights if I wear M&S XL?

[SheSaysShush]

I'm not normally incapable of making this kind of decision, but it's proving difficult. My brain won't decide.

I am 5'2 and wear a size XL from M&S. I'd say I was a size 18 in most shops.

Snag size guide attached, I'm 'curvilicious'

Please help :)

E

Thank you, now I've written it down it makes sense 🙄