Hi Jay,
The following are US based suppliers, however, they may be willing to drop ship in the UK for you if you ask.
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Below is a supplier for tree climbing equipment, they may have something that might interest you. And although they're a wholesaler, you can still check to see if they can drop ship for you.
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Don’t forget to let us know how you get on with these suppliers by submitting a review on the supplier profile page after you make contact or place an order.
All the best!