[DanUK]

Thanks for all the advice.

Unfortunately it is heavily modified and whilst I could (relatively) easily get it to work with PHP7 whose EOL comes this year, I think it is quite different getting it to work with 7.1 and 7.2 to the point where I think XC5 is really the only way forward for longevity and ease of updating. I guess I need to aquaint myself with XC5's 'flawless upgrade feature' to see if it really is very different to what XC4 offers.

Dan