Okay, Richard on the Support Desk got back to me within 20 minutes and found everything to be okay, but I still had the problem from my end. Checked via another computer, same problem. Richard checked again and found everything to be okay, but I still had the problem.
This is where 99% of all hosting companies assume the customer has lost the plot and offer no further help.
Not TCH. Bill Kish checked it too and found all to be okay and told me that it was a client side issue. He then offered the advice I needed to find and solve the problem.
And that's what I did. The firmware for my Router was timing me out when logging in to directories that contained more than a few files. I upgraded the firmware and hey presto I'm back in business.
A big apology for wasting everyone's time today.
But this is just yet another example of why TCH rocks!
Thank you TCH!