Clearing PocketSOAP
PocketSOAP was separately installed with (now) quite old versions of the Aqilla MS Excel Add-in (it's now embedded in the add-in and does not appear separately). Sometimes the PocketSOAP uninstaller leaves traces of PocketSOAP which you need to hunt down.
Start MS Excel and from Excel Options uncheck AqillaWebServiceAddin.
Close Excel.
Run a disk search and delete aqillaaddin.xla where found.
Delete AqillaXLFunctions.dll from c:\windows\system32 and / or c:\windows\SysWOW64.
Uninstall PocketSOAP from Control Panel > Programs > Program and Features. If not there, delete folder c:\Program Files*\Simon Fell.
Reboot.