Posted: 18/03/2015 at 13:55
Cutting off the ponds water supply would be the first step. If it has a lining then removing that or at least puncturing it would be the second step. Adding more compost would gradually build it up and the wildlife in their would start to leave quite quickly. You can leave the lining if you want a bog style garden of course.
End of the day it is your garden and therefore has to suit you...the wildlife found the pond they will find another.