This looks like a **combination of  keyword stuffing** and **people in the UK apparently wanting unisex products**. It might be like labeling things that don't normally contain gluten as gluten-free for the extra exposure.

For example of **keyword stuffing** in titles consider,

 - Coleman Water Repellent Instant Tourer Unisex Outdoor Pop-up Tent available in Green - 4 Persons
 - Coleman Weatherproof Galiano Unisex Outdoor Pop-up Tent
See Size Options
Coleman Weatherproof Galiano Unisex Outdoor Pop-up Tent
 - Yellowstone Waterproof Fast Pitch Unisex Outdoor Pop-Up Tent
 - Regatta Waterproof Malawi Unisex Outdoor Pop-Up Tent
 - Easycamp Unisex Cyrus 200 Tent, Aqua Blue, One Size

As far as the **UK** is concerned, I search "unisex tent" on both amazon.com and amazon.co.uk in the Sports & Outdoors section.

 - amazon.com -> "Showing results for "unisex tent" in Toys & Games. Search in Sports & Outdoors instead."
 - amazon.co.uk Lots and lots of tents.

Also supporting this theory are these results searching amazon.co.uk for "unisex"

- Kingfisher **Unisex** Olham Rubber Steel Shaft Camping Tent **Mallet**, Black
- JOOWEN **Unisex** Two Tone Cotton Twill Unstructured **Baseball Ca**p Adjustable Dad Hat
- Under Armour Undeniable 3.0 Md **Unisex** Sport **Duffel**
- Gelert **Unisex** **Wind Blocker**
- NGT **Unisex** **Stainless Baiting Tool Set in Sleeve** (4 Piece), Green, One Size
- Mora **Unisex** 163s **Spoon and Bowl Crook Carving Knife,** Natural

Mallets, knives, windblockers and duffel bags don't seem to be specific to one gender, I don't see why a tent would be.