My trusty, and used, Mordaunt Short subwoofer died as I was watching Band of Brothers so I had to get a new one.
I did some research and reading about and came across the Cambridge Audio SX120. A much newer and lighter model when compared to the MS model.
I bought it from Richer Sounds for around £120 (Amazon selling the same model for double the price). I thought it was a fair amount.
I have uploaded an unboxing video to YouTube:
The Mordaunt Short subwoofer is available for sale for spares and repairs for anyone who wants to repair it or keep it for spares. See the for sale here on eBay.