One of the ports is shorted or you have the DISA turned on. Start by dialing each extension 101-1xx on the 824 and make sure that none of them are tripping the ring. You'll probably find that one of the ports is bad, the wiring is bad, or there is a programming issue. IIRC the U.K. system is not delivered with DISA, but you may have installed or turned on that feature.
Carl
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