Thanks.
I hear what you're saying about price but from somebody who spent 30 years selling it's very common for price to have no relevance at all to the quality. Hence the reason I'm not shopping for the high priced mazuma cartridges. Personally I don't believe they offer value for money.
Unfortunately that's one of the problems here. It's not only a case of checking the specs and finding value for money it's wondering if the specs advertised a genuine.
To be quite honest I'll be surprised if I get an answer here that satisfies me, but I've been surprised before.
Cheers