Improving drainage help

Double digging was something devised by senior gardeners for the apprentices, under gardeners to do over the winter. It kept them busy, out of trouble and you knew where to find them.
Meanwhile the senior gardeners where in the glasshouses taking cuttings, sowing seeds, smoking pipes etc.
Every profession/trade had similar tasks.

 

Bit late for this year but if you have really claggy clay soil I'd try winter green manure, something like grazing rye, it works if you dig it in when the clay is drying slightly, wait too long and it will be hard work.
The rye really helps the drying out in early spring and the roots make the soil nice and friable.

The digging in also adds the top growth for humus.

Better if you can do it over a couple of years at least, so any bare soil gets covered.