There are reviews of each @ Hifi Choice (think that they are both in the current review section).
http://www.hifichoice.co.uk/
I listeneed to the Pembroke a few years ago (liked them), but am not familar with the Harlech.
Once owned the Castle Isis and have listened to earlier versions of the Richmond a few times.
The Hifi Choice review of the Pembroke is accurate, IMO, as are most of their reviews on the gear I am familar with.
http://www.hifichoice.co.uk/
I listeneed to the Pembroke a few years ago (liked them), but am not familar with the Harlech.
Once owned the Castle Isis and have listened to earlier versions of the Richmond a few times.
The Hifi Choice review of the Pembroke is accurate, IMO, as are most of their reviews on the gear I am familar with.