winter allotment waterlogging

hello, completely new to both this and indeed any forum so please bear with me…

our allotment site in north london has regular waterlogging where the land falls and the committee are looking at installing land drainage, possibly feeding into wildlife-friendly ponds. does anyone have any experience of rectifying this situation and possibly even a landscape contractor they could recommend?

thanks in advance for your time + comments

hi

thanks for replying, seems to be about 8 plots