Yes, security at Hyde Park Winter Wonderland in London is extremely tight, and 100% bag checks are mandatory for entry. Upon arrival, every guest must pass through a security screening area which includes a manual bag search and often a walkthrough metal detector. There are strict limits on bag size; typically, you are advised not to bring anything larger than a small rucksack or handbag, and there are no luggage storage facilities on-site. Prohibited items include glass bottles (including perfume), alcohol, knives, and any large containers of liquid. You are usually allowed to bring a factory-sealed bottle of water, but open containers may be searched or emptied. Because of these checks, the queues to enter can be quite long during peak evening hours or weekends, so it is highly recommended to arrive at least 30 to 45 minutes before any scheduled attraction tickets (like the Giant Wheel or Ice Skating) to ensure you clear security in time.