Your soil is probably a combination of these soils commonly found in gardens in the U.K., I have described them in more detail here;
Sandy Soil has a gritty texture and is formed from weathered rock like limestone, quartz, granite, and shale. It is easy to cultivate, but does not retain moisture or nutrients very well. Adding lots of organic matter helps and on the plus side sandy soil is easy to dig over. The easy solution is to grow plants that like sandy soil, like most herbs.
Silty soil is very fertile soil, holding more nutrients than sandy soil holds moisture and drains well. It has a smooth dark texture and looks like dark sand.
When clay soils are wet they are very sticky, lumpy and pliable, but when dry form rock-hard clots. Clay soil is hard to work and prone to water logging. Blue or grey clays have poor
aeration and would need to be improved to grow most plants. Red clay soil has good
aeration and drains well, but is still difficult to dig over. However, because clay soil has high nutrient levels, it is worth sorting out the garden drainage as most plants will grow well in
These plants thrive in clay plants to grow in clay
Loamy soils are a combination of sand, silt and clay. Loamy soils are mostly easy to dig over very fertile and full of organic matter, they drain well, retain
moisture and hold a lot of nutrients. The perfect soil.
Peaty soil contains more organic material than other soils, but fewer nutrients and is prone to sogginess. You may need to add compost and sort out the drainage to get the best out of your
Chalky soils are alkaline and full of stones, dry out quickly and lack trace elements such as iron and manganese causing poor growth and yellowing of leaves. Chalky soil is extremely poor quality and would need to be greatly improved to grow most garden plants.
These plants will grow in chalky soil plants for chalky soil
A simple way of testing your garden soil is to take a small amount of wet soil in your hand. Knead it into a smooth paste, then roll it about between your hands to form a ball.
It is easy to test the pH of your soil using a simple soil pH meter, which is simply pushed into the soil available from amazon.
Or for a more detailed pH test, use the kit that includes colour charts and tubes featured here.
A pH test measures soil acidity or alkalinity. A pH 7.0 is considered neutral. An acid soil has a pH value below 7.0. Above pH 7.0 the soil is alkaline.
It is costly to change the pH of your soil and doesn't work over the long-term, instead try growing plants that will be happy in your type of soil.