It sounds like you're looking into products — possibly to compare them, check ingredients, or understand how they work.
If you have purchased a chemical unblocker (e.g., or Buster Bathroom Plughole Unblocker ) from B&Q, follow this process: b and q toilet unblocker
For more stubborn blockages, B&Q sells manual drain cleaning tools. These are often plastic rods or flexible "snakes" with a hook or auger on the end. It sounds like you're looking into products —
Often cited as one of the best for toilets, its bellows design pushes a massive 1.5 liters of water/air with each plunge to dislodge deep clogs. b and q toilet unblocker