You can take perfume on a UK flight. The limit that matters is the cabin liquids rule.
Hand luggage
Each bottle must be 100ml or under. It must go in a single transparent resealable bag, with your other liquids. Most of our bottles are 100ml, so they fit. Keep them in the box so the spray is protected.
Hold luggage
Larger bottles can go in the hold. Tape the cap, bag the bottle, put it in the centre of the case. Pressure and cold can make cheap plastic pumps leak. A sealed manufacturer bottle is more reliable than a decant.
Oils and minis
Perfume oils still count as liquids. Minis and travel size sprays make this easier. If you only need a few days away, a 100ml is still a lot of juice. You will not finish Khamrah on a week in Spain.