In an attempt to stop all the errors that are happening with the site, I've installed a completely unmodified and up to date version of the forum's software - SMF.
This is a temporary fix, but hopefully it'll stop the errors you've been experiencing whilst using the board.
If you come across anything strange, or across any of the old errors, please let me know in this thread. The site content (committee page, about us, boathouse map etc.) are gone for now.