Thanks Tara. I am able to ftp to the server and have found the error log and access log in the /logfiles folder. Although not exactly sure how to read them, I have downloaded them and used notepad to open the error log. From what I can fathom out, the last error log in it says:
Sat Apr 02 16:42:06.592769 2016] [fcgid:warn] [pid 11060] (104)Connection reset by peer: [client 86.169.50.52:43592] mod_fcgid: ap_pass_brigade failed in handle_request_ipc function, referer: http://claritycareconsulting.co.uk/wp-login.php?redirect_to=http%3A%2F%2Fwww.claritycareconsulting.co.uk%2Fwp-admin%2F&reauth=1
Does that help?