The North West region will, after the apocolypse, consist of GMP, Lancs, Cheshire and North Wales. The theory is that they will each pick up a proportion of the work that Merseyside would have covered. Clearly none of those units are as ideally placed to deal with the hotspots in the Liverpool area as Merseyside are/were from a response time perspective. Maybe that's why there was a police helicopter based at Woodvale in the first place!
However, if I were in the central control room deploying an asset to a Merseyside task I'd look to Cheshire first. Why, they've only been operating one shift a day with an annual allowance of 500 hours so perhaps there isn't a lot going on in the Cheshire area and secondly, 3 of the 4 pilots previousy based at Woodvale will be crewing the Cheshire aircraft so their operational knowledge of the Merseyside force area will be invaluable.