Hi Michael
As a temporary measure I had to do a cheat with the ‘Featured Post Widget’ plugin (see https://www.cheltenhamfrenchtuition.co.uk because it gave me a good sidebar layout i.e. testimonial image above text rather than text wrapping around which can look untidy, followed by a ‘read more’ link. You could then have the company name, company website etc after the read more link.
It would be fantastic if you could also provide shortcodes to list the testimonials within a testimonials entry page showing the thumbnail on the left, then testimonial title and excerpt underneath it.
Clicking the readmore will then link you to the testimonial.
Hope that helps rather than confuses
Laurence
Laurence