Northern Accelerator funding comes from Research England’s Connecting Capability Fund and this is fairly flexible in terms of allowable costs. The overriding principle is that the funding should be used for the purpose it is awarded i.e. to advance the commercialisation of university research.
You should make sure that it is clear in your application how the costs submitted relate to the commercialisation objective. The Guidance for Applicants provides a little more detail and your technology transfer contact should be able to advise.