If I were flying the same route as you, I find out the current information from Humberside ATIS before calling them. I wouldn't ask for a specific service when approaching the ATZ, but I would request joining instructions;
"Humberside Radar, G-XXXX, overhead [VRP], request joining instructions."
I've never flown into Humberside, but you're likely to receive instructions to join the circuit either downwind or base etc for the active runway.
Hope this helps.
DS