Telephone: 01872 263692 (Mon-Fri 09:00-17:30)Email Us: Explore London from the sky with this self-guided Spy Mission themed walking Treasure Trail. Within the Park is Park House Garden, a tranquil landscaped sensory garden designed with the disabled and visually impaired in mind. Show Search. Starts on York Street, Bath, BA1 1NH. You'll need to keep your eyes peeled and your wits about you to crack this Spy Mission-themed Treasure Trail. Explore Glasgow's West End with this self guided Spy Mission themed Treasure Trail. Over a 2 mile route and 22 clues, you’ll need eagle eyes and serious problem-busting skills.