Re: ignoring the fact of Prior Art ?
> We looked at patents at the time, but decided there was no point as it was all software and mathematical methods
Did this "we" also include your patent attorney? In that case there many more questions.
Software and mathematics, as such, are not patentable under EPC, and also harder in the US than it used to. So the US patent is unlikely to make it in Europe but that still will cost you some freedom to operate in the US. So I am surprised your patent attorney did not recommend monitoring and possibly filing a third party observation or similar.