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Sorry for the delay getting back to you all. Ive recently been told that all this "Frontline is not working anymore" has started since it has been announced that Frontline is not going to be prescription/controlled anymore. Not sure I totally believe that, but we got our house sprayed, used up the last of our Frontline and so far so good, its been nearly 3 weeks now. Hopefully with British Summertime 'unofficially' ended things will calm down too.
Thanks everyone