Rent 16 channel microphone splitter + XLR snakes flypack in London (rent for £23.00 / day, £13.14 / week)
HiroSys - HiroSys Limited
Setting up a cheap mic-splitter for two audio consoles - Stage Left Audio
Rack Mountable 16 Channel XLR TRS Combo Send Splitter Snake with a 15' and 30' XLR fantail trunk | Pro Audio Stage, Road, or Studio Y Splitter Cable Snakes | 15 foot
Seismic Audio Rack Mount 16 Channel TRS Combo Splitter Snake Cable-5' and 30' XLR Trunks (SARMSS-16x530)