Aden 25 – why discontinued

I know the Aden 30mm cannon was a stalwart of British fighters for many a long year, and I know that during the development of not only the Harrier GR5 but also Hawk 200 there was effort to establish a more modern version under the description of Aden 25.

Whilst I know the project was cancelled and Harriers flew around with the empty gunpods – Im struggling to find information that tells me what went wrong with it and why it was cancelled, was it a case that they just thought that compared to the 27mm mauser cannon fitted to the Tornado that there was just no point in competing?

Be interested to understand the reasons