Thanks Howard

We do have a management server that would be accessible from both front-ends.  Just not really sure whether I should put memcached on it as this server does other tasks such as cron and acting as a 3rd web node if we have problems with the cluster

I suppose if I installed Memcached on this server I would have to make both webs access it, along with having itself access its self!

This is looking less likely to be worth it and more likely that I would need a dedicated VM

Cheers