Not exactly the Bridge of the river kwai in thailand more like the Bridge over the River Colne, but when ever I think of a bridge it reminds me of my first trip to Thailand when I went on a day trip to see the bridge and I was nursing a hangover from the night before due to all the singha beer I had for the first time.
Anyway you are looking for a small magnetic tube on the bridge but do be careful when you find it you dont drop it in the river. You'll also need tweezers or a paperclip to get the log out.
The bridge is a short walk away from Dalton Bank Nature Reserve and we use to walk over this bridge a lot during lock down when we would walk from Leeds Road to the nature reserve.
Hope you enjoy the find and this is my first cache I've placed.