Grrr...
Over the last couple of years, I've migrated two websites from their original hosting company to the same people who are my current ISP. This was because of persistent "500 Internal Server Error" problems, always due to excessive load on the database servers. These sites were flies&bikes and the North Bucks Road Club sites. Since relocation, no problems whatsoever.
Now, I find that the Team Grumpy site is effectively non-functional for the same reason, and advice from the hosting company is to make a copy of the database using phpMyAdmin, and use that to populate a new database on a different server. That's a really easy thing to do...in principle, except that phpMyAdmin just times out, presumably due to the same server issues...leaving me in an annoying Catch 22 situation.