The 41-year-old, known for his appearance onUniversity Challenge, received the honour for his dedicated services to public libraries.
Seagull initially mistook the official letter for a jury duty summons before discovering the prestigious accolade, which he attributes to his childhood visits to East Ham Library.
He emphasised that weekly library visits shaped his knowledge and career, stating that libraries are "the beating hearts of our high streets and communities."
As an ambassador for The Reading Agency and a former champion of CILIP, Seagull continues to advocate for the proper funding and use of libraries.