It is a large garden, very open, which would require a lot of wee or sweaty vests.
Bb ammo are small plastic pellets, as they are used in games similar to paintballing, iI doubt very much they would cause any harm, just wondered if they would give it enough discouragement.
I have had mixed results with those fox deterrent devices they often seem to work for a while then they ignore them the same with cat ones.
I would try a couple of deterrant devices at entry and exit points if you can watch the fox he/she will have a route they take through your garden as part of their nightly patrol if you can make it difficult for them to get over a fence or block a hole up you may well redirect them also do not leave food out for other animals overnight.
It's illegal to shoot foxes with air rifles or bb guns. if you deter one fox, another is likely to take its place. All you can do is make your garden as secure as unattractive as possible by blocking off the entry points they're using, remove access to food sources, block any hiding places etc.
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