Sonnyjim, don't worry about the number of revisions. I have read of several members that had more than 3. I think there was one guy at 6. A better measure is I have never read of a man that couldn't get a revision because he was maxed out.
Personally, I think that you should study how the NHS covers implants & the eventual revisions. Once you know the system you should be able to navigate it better & faster when that time comes.
The final frontier. Deciding when, if and how.