Dear PlusNet PAYH trial support folks, Whilst checking the options available in the (new to me) Plesk Control Panel I note we can enable SSL (and indeed it works) - I assume this is a "no cost" option? ...later: see follow-up post for the SSL "gotcha", it works, but ... Many thanks for your support.
Have found the "gotcha" - the SSL certificate is, shall we say, "not ideal" (see attachment) So, am guessing that there won't be a charge for this SSL - but many (most?) might find the SSL Cert off-putting and thus it isn't a great option as it stands, never mind was a nice idea initially.