IONOS have repaired your .htaccess file; your site is now using the SSL certificate; https://historicedinburghtours.co.uk and https://www.historicedinburghtours.co.uk both show the current website.
To isolate the Safari problem: maybe create a small XARA doc, copy and paste the offending photos that do not display correctly in Safari and let TG have a look at it; confirm whether the problem exists in both variants or just one of them.
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