I’m afraid I can’t help. For a few years we used Green Thumb which cost £67 pcm. The results were very good so we did not begrudge the expenditure but when the energy price crisis descended it was one of the first economies we made.
I think they've merged with Miracle-Gro/Evergreen and the products are no longer branded as Scotts. Searching on a well known website comes up with these options: Amazon.co.uk : Scotts Miracle-Gro
I have just been looking this up. Scott’s merged with Miracle Gro in 1995 and in 2017 sold their European interests to a private equity firm that has in its portfolio, among many others, Immediate Media, Moonpig and Wowcher.
Always bought Lawn Builder and its autumn version - don't think many lawn feeds are slow-release like those are. Be interested if anyone has any recommendations.
Posts
https://totalamenity.co.uk/icl/
In a recent Which? survey of lawn fertilisers, their two Best Buy products were
Vitax Green Up Enhance Granular Lawn Feed
and
Miracle-Gro Evergreen Fast Green
This supplier states that Scotts Lawn Builder has been discontinued: Scotts Lawn Builder Lawn Feed - 8kg | Free UK Delivery (greenfingers.com)
Hope this helps.