No ANY records found for mxb.nic.uk.
Try nic.uk instead?
id 64398, opcode QUERY, rcode NOTIMP, flags QR RD RA ;QUESTION mxb.nic.uk. IN ANY ;ANSWER ;AUTHORITY ;ADDITIONAL
whatsmydns.net ANY Record Lookup tool lets you query DNS servers and get instant results.
Looking for easier to understand results? Use the Global DNS Checker tool.