Check out the dodgy hearing aids as Portcullis House residents gatecrash Cocklemoor knees-up.
Silent discos can be rather odd for first timers. People are dancing to whatever's being broadcast on either the red, green or blue light wavelengths.
If you're not wearing any headphones, it can seem like a herd of groaning zombies as each person attempts to sing what he or she is dancing to.
Happens at Portcullis House most weekends apparently, when all the visitors have gone home.
There are no further details.
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