Hi Nodiggitty,
I’m just entering the 4TH year on London Clay, having built up beds on a grass pasture. Make sure the ground drains away,and is not a ‘sump’ for the surrounding district.If needs be, create soakaways/french drains off the paths, which tend to be lower than the beds.
Clays are fertile and retain moisture in drought years. They respond well to no_dig methods, especially if you can keep traffic to a minimum. The old problem when digging, was to be able to break down clods, especially if spring worked but it doesn’t arise much now, the soil is not compacted therefore no mechanical intervention.
In extreme wet conditions, utilise ‘duckboards’to spread your weight, if planting out just cannot wait.
