Cat Calming/ anti-stress products (Beckenham)

Does anyone have any cat calming products that they could spare please? I would really like to try those diffuser things, eg. Feliway or Therapet MD or any of the others which contain pheromones. Or spot-on versions if anyone has any?
My two cats are not getting on at the moment & little Freddie is very stressed, even when his big brother is not around :-(
Can you help with this request?
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