[postie steve]

My allotment is in what was the builders yard when the area was built the soil is very heavy to work. It was suggested to me to use sand to lighten it can anyone please help which sand to use thanks.

[the Kergan]

I think you would need what is known as sharp sand.
Welcome to the forum by the way

[mattwragg94]

hi steve and welcome to the site, can you put your location in your profile please as it may help us to answer any of your future questions.

all the best,
matt.

[Yorkie]

If the soil is mainly clay, then yes you can add sharp sand - but actually, organic matter over time is the best solution.

[Swing Swang]

Or even both sharp sand and organics. I too live in Basingstoke and this approach was needed to increase the depth of a scant 5" of clay on chalk.