Scoot has been recommended by The Fox Project Charity, as a humane deterrent that is effective and kind to flora and fauna.
Each box of Scoot contains 2 x 50g sachets of powder. Each 50g sachet diluted with 9 litres of water covers an area of 16m2.
For smaller gardens, or for increased concentration, you can reduce the amount of water added down to a minimum of 2.5 litres.
The less water you use, the higher the concentration and effectiveness of the scent, but the trade-off is that a more concentrated solution won’t cover such a large area. Also worth bearing in mind is that 9 litres of water is much heavier to lift than 2.5 litres.
If you're unsure, add around 5 litres of water and see if this is enough to cover the areas in need of protection.
When you spray Scoot for the first time, the fox is alerted to a perceived new threat in its territory. Rather than surrender immediately, it will respond by marking the territory again to re-establish control. If you then do nothing, the fox will think it has scared off the intruder and treat the situation as a mild inconvenience. Normal service (i.e. damage to your garden) will quickly resume.