Saw opaque tights recommended on the 'What's good in Primark' thread. Popped in when I was in town yesterday and picked up two pairs in black 80 denier and 200 denier (really wanted 100 but none in my size).
Have tried them on and they're lovely - perfect fit, even colour. And, even better, they have a label in to say what denier they are - what a time saver in the mornings! Not all M&S tights seem to have that these days.
My usual go to opaques are M&S Autograph velvet touch but my most recent pair are all baggy on the feet and ankles - a bit Nora Batty.
I'm definitely going back for some 40 denier ones.