A browser warns the visitor before the gallery even loads.
What I sawThe security certificate served for lymington-picture-framing.co.uk does not belong to the domain. It belongs to the hosting server (the certificate names tb-be03-hclnxs015a.srv.teamblue-ops.net, not your site). Because the names do not match, a modern browser stops on a full red warning page, NET::ERR_CERT_COMMON_NAME_INVALID, that asks the visitor whether they are sure they want to continue. Most people in Lymington looking for a framer will simply close the tab. The gallery is doing nothing wrong, but the host has it on the wrong certificate.
What the rebuild doesThe rebuild is served over a correct certificate for the domain, issued and renewed automatically, so the padlock is clean and no warning ever shows. The site loads straight to the gallery, the way a visitor expects.