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Vijay_E
Mar 06, 2017Cirrus
Based on the header provided, it looks like a server error and not F5 error.
Try doing this:
curl -IL http://www.kerrdental.co.uk/AccessoriesForFillingMaterials/AmalgamAccessories/AmalgamGuns
You should get a 301 redirect as the 1st response and then try to follow what the subsequent responses are in order to identify the problem.