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Its not just a plug, it appears to be a combined extension lead/socket/plug device. As it would appear to be ok electrically, a drop of superglue would be the simplest answer. Alternatively, replace the whole extension lead.
Hi
Many thanks for all of your replies, I took your advice Liquorice and put a bit of super glue on the plug in the hope that all would be OK however whilst I got a dialling tone off the extension unfortunately the broadband wouldn't connect, just got the flashing orange light. When I connected direct into the master socket no problem at all, the fact that I have a dialling tone but can't access broadband does this suggest there's a problem with the plug after all?
Are you connecting the extension plug via the filter that is shown in the photo? If so, broadband won't work at the extension as the line will be filtered. Connect directly to the master socket and use the filter at the extension.