Hello lez99,
Thanks for using Apple Support Communities. I see you're running into an issue with images in Safari.
Does this happen with every website?
There are some great steps that may help with this here: If Safari displays a blank page or quits on your iPhone, iPad, or iPod touch.
You mentioned it's happening on two devices. If you test on your iPhone X using Wi-Fi, and then test again using just cellular data, do you notice a difference?
You might also try clearing your history and website data, and then testing again. To do this, tap Settings > Safari > Clear History & Website Data. Then, Restart your iPhone, iPad, or iPod touch and give it a try.
To look at another possibility, are you running iOS 12 under Settings > General > About, or iOS 12.1.1? If you're running a version earlier than 12.1.1, I recommend making a backup and then updating. Here's How to back up your iPhone, iPad, and iPod touch and Update your iPhone, iPad, or iPod touch. Updating may help to clear up issues with websites and Safari.
I hope this helps you.
Kind regards.