We live in a flat with a shared garden, the deeds reflect this and both property owners regard it as such. There is a drain that both properties feed into in the garden. At intervals it gets blocked, my DP has dealt with it since we moved in. Its backed up again this week l noticed tonight. It is a grim job to sort but water is about to lap into the garden, it stinks and lots of rain is forecast for this weekend where we are. lm trying to think of a polite way to communicate to our neighbours that’s it’s their turn to sort it. Any suggestions?