Kingfishers MBC are not listed in our club sites so it's possible we have no members
from this club. However they did ask Mayhem to list their club in 2008 with the following details "We are The Kingfishers Model Boat Club. We meet on the third Monday of the month except December in Sutton Bridge
We sail in Long Sutton on Wednesdays and Sundays
We are just off the A17 just in Lincolnshire with members
from Linc's, Norfolk and Camb's, for more info contact 01406 350968 or 01945 584241. it was 9 years ago so this may not be current but a polite phone call may elicit the current position.
There is another post from 2012 suggesting "Spalding club meet on Sundays behind the NFU offices in Springfields if not The Kingfishers Model Boat Club meet in Sutton Bridge and have the use of a lake in Long Sutton and one in Sutton Bridge.
Good luck and I am sure you will find somewhere to sail.