So sorry I have just realised I forgot the backslash before the images folder, I have now amended (see below) and it works fine.
So sorry to have wasted your time.
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Thanks again Susie
As John says, it's often helpful to run something past another pair of eyes.
It's also a good idea to put your pages through the validator as it will pick up any errors that might not stop the page working now but may come back to bite you later.
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