Sainsbury's Tablets
Looking at those tablets alone, I would suggest that McBride made them.
The cambered edge is very similar (steep angle) to Aldi's Almat 2017 tablets, made by McBride.
I have Tesco Bio tablets by Persan of Spain, standard right-angled edge.
Aldi Almat 2015 tablets by Dalli have a very slightly depressed 'rim', but nothing like McBride's.