Studio Mug marked dfp. - w

Studio mug with incised vertical bars. Two marks: dfp. and W (or possibly intersecting VV). A similar mark is attributed to David Frith at http://www.ceramike.com/UFOpots.asp but this seems a bit unlikely to me.

The mark does look similar to david frith at the brookhouse pottery ,but there are slight variations to it , strangely the W mark looks a bit like Warwick Parker, I'm sure somebody else will know this one .

The glaze is similar to this and the mark: do people think the above could be a variation of David Frith's mark?

I'm sure it is I had a piece with similar mark and Margaret Frith confirmed it was by David, I'm sure she will confirm if you email her.

I have a Jug with six mugs with the same mark. I would like to have it confirmed that it really is David´s. You say "E-mail Margreth". Where may I find her adress?

If you look on the Frith Pottery website there is a link I used to contact her and its Margaret not Margreth. Regards Diane

Thank you! And sorry for my misstake.