Unfortunately in the UK, mace and pepper spray is illegal. However, most supermarkets sell cheap extra strength insect repellent spray that will do the job : r/lifehacks
STV Zero In Bed Bug Killer Spray Crawling Insect Dust Mite Poison Treatment | eBay
Sainsbury's Extra Strength Insect Repellent 125ml - HelloSupermarket
Insect repellent & travel health | Sainsbury's
The incognito story | Triodos Bank
Insect repellent & travel health | Sainsbury's
Incognito Anti-mosquito Spray 100ml
Sainsbury's Extra Strength Insect Repellent (125ml) - Compare Prices & Where To Buy - Trolley.co.uk
Multi use spray hi-res stock photography and images - Alamy
Sainsbury's Extra Strength Insect Repellent (50ml) - Compare Prices & Where To Buy - Trolley.co.uk
Insect repellent & travel health | Sainsbury's
Insect repellent & travel health | Sainsbury's
Incognito Anti-mosquito Spray 100ml
Clear Wasp & Fly Killer Spray 400ml | Sainsbury's
PIC Flame Effect Solar Portable Insect Killer Torch Outdoor Insect Trap in the Insect Traps department at Lowes.com