1. Make prokem.co.uk the master domain rather than prokem-corrosion-protection.com
2. Ensure each http URL is 301 redirected to its https counterpart via htaccess rather than in plesk
3. 301 redirect each www.prokem-corrosion-protection.com URL to its co.uk counterpart via htaccess. I can provide a list of pages to redirect as there are a number of duplicate pages that will need removing.
It probably makes sense to implement these other changes at the same time:
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Remove all of the canonical tags currently on the site.
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Leverage browser caching by following Google’s page speed recommendations - https://developers.google.com/speed/docs/insights/LeverageBrowserCaching
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Losslessly compress all of the website’s images.
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Combine and minify the website’s JavaScript