I just learnt Seresto collars are available without prescription now.  So - just in case anyone else didn't know...   (I've previously used Scalibor because it was non-prescription so I'm going to try Seresto next I think!)

I'd forgotten these collars were on prescription!!   However, be careful.   I had one for my Basset and had to take it off after a short time as it was making the skin under his chin very sore.   Seresto collars are supposed to be very good however.