It gets no play during Wimbledon Fortnight because it is used for ticket queuing, catering and parking.
It's a bit of a marker for me with my time in London, because when I moved here I phoned up looking for a hit (I live 10mins away) and they told me the visitor fee was £45. I was speechless, thanked them, hung up and couldn't believe golf in England was so EXPENSIVE!!!
Hindsight is a great thing.
I've still not played it, but I have walked around bits of it while doing other stuff and it looks reasonable for a suburban course. The condition is impeccable in summer.