HNL- EWR-LHR is about yearly for me. Don’t about specific concourses - the gate situation for a HNL arrival can be very fluid. I’ve seen it it change 2-3 time in day(s) before arrival. The important thing is that HNL arrival and LHR departure will both be into and out of a C gate, and both post-security in same terminal. Anyone saying they know what gate/concourse a HNL flight will go into is just guessing.