Toms
Yes the club touts 300 bunkers. It now has around 100 and I saw about 80 filled. Not sure where the rest are/were!
Like Tom M points out. Colt tended to bunker heavily when the land wasn't very exciting. Which isn't the case for Tandridge: the front 9 rolls nicely and the back 9 is spectacular.
TomP makes a good point about fill. There's clearly a lot done on the course.
Form what I can work out. The course had the full number of bunkers until the 60s/70s.
Recently Donald Steel came in and added some bunkers for the modern game. Here's my take:
He's tried to be sypathetic to Colt. The aren't obtrusive, but I think he isn't sympathetic to Colt's style at Tandridge; which is clearly big and bold in the old pics. Steel's bunker work at Tandridge is almost identical to that at Beaconsfield which is a very different course.
Steel's bunkers mostly appear to be on the far outside of the dogleg to punish the bail out for the longer hitter (see the tee shot photo of the 5th, but it's also true for the 3rd and 11th). In my experience this is the opposite of what Colt tended to do. He prefered to bunker on a diagonal, with the furthest bunker on the agressive, inside line.
Steel did some good work in clearing out trees. They could do some more, to open up sweeping views of the North Downs.
The club is aware of its history. And simply states it filled bunkers for maintenance/expense reasons. Since the club clearly has a very wealthy membership, I think this reasoning isn't sound; particularly since the course was maintained, as designed, for several decades.
I'd like to see the following restored, as a start:
2nd as NAF points out. Take out most of the trees on the right and return the central bunker, to the centre!
3rd. Similarly, clear out most of the trees and return the central bunker. It's a dullish hole as it is now.
4th, 18th. Put the full face bunkers back. It suits the terrain and the current traps look lame.
I wouldn't advocate returning all the bunkers because some of the tree growth adds to the course, in a landscape sense. And I get the impression that some of those bunkers were in place on the heavy slopes, to stop a ball bounding down onto adjacent fairways: now the trees do that job.
Can't see any of this happening though. There just isn't any kind of "restoration" momentum in the UK.