Transferring web hosting raised just one really significant issue. That was due to the new hosting server running Apache 2 with mod_security. This appears to have an unfortunate quirk of being unhappy with most European accented letters in the the URLs – causing an HTTP 406 error.
We switched to a new web hosting company just before the Christmas break and after a few small transfer problems the website seems to be running nicely. The move was really forced on us because the previous web server had become so slow that main Plant Base installation download was taking up to 5 hours. Thankfully everything is much quicker now – the install download is back to just a few minutes on a good broadband connection and the online database is much faster too.