Here is a view of the British dugouts and Lettenberg which were excavated in 2004. They are stunning. One of the dugouts is a bat sanctuary. There were none in situ when we visited.
The two pix from Lijssenthoek cemetery show the scale of the place. It has over 10,000 graves and is the second biggest British type in Belgium. There are British Empire, Chinese, Germans, French and even a few Americans there (which is unusual, the yanks are usually buried in exclusively US locations.
The memorial on the grave of Albert Bogg is one of the finest I've seen. A loving testament from the granddaughter he never saw.