One Wing48 – There may not be too much difference at present as BA has a sale on. I can’t comment on the destination you have chosen or class, but from my experience Middle and Far East in Club World can be considerably cheap.
I have found that Brussels is a good departure point, although one thing I have found is that it can differ depending on when you look, e.g AMS is cheaper today but tomorrow BRU is. Mrs T and I recently did BRU-LHR-DXB, returning HKG-LHR-BRU and saved just over £2,000 in Club World, with shareholder discount as well, over the direct option. We made a weekend of one of the trips staying at the Hilton and used standard class Eurostar. I would guess that we spent around £500 on the weekend trips but need not have bothered. Also we had a week between arriving and departing LHR
Hope that helps