Temprance -
Thank you for your reply.
The long wait would not apply as I have health insurance to cover the
operations (and I therefore won't be a drain on the NHS either!)
My question relates to the risks involved.  My research on the Internet
has shown that complications (especially in such things as DVT and
cardiovascular problems) are more than doubly likely by having the
bilateral.  This has more or less made my mind up to have the knees
replaced one at a time.  Am I right?  Or should I ignore all this in
order to get (hopefully) a one hit "cure"?
Would love to hear the experiences of someone who has had both knees
replaced during the same operation and any extra problems incurred.