If your buying from halfords then the I will certainly vouch for the meguiars smooth surface clay kit.
This was the first ever clay experience i had and tbh i still use it when I run out and need a quick fix when I have no time to wait.
Zymol is very overpriced with a lot of products and at present all clays are patented by one sole manufacturer that distributes to all manufacturers so many of the clays are all the same just diferent colours and softness.
If you were to order online then without question bilthambre clay is the best on the market both for cost and quality.
This was the first ever clay experience i had and tbh i still use it when I run out and need a quick fix when I have no time to wait.
Zymol is very overpriced with a lot of products and at present all clays are patented by one sole manufacturer that distributes to all manufacturers so many of the clays are all the same just diferent colours and softness.
If you were to order online then without question bilthambre clay is the best on the market both for cost and quality.