I liked it better this week - I found it a bit wild, last.
I think, @Ladybrrrd , Siobhan is a wee bit alternative for some folks. The default female TV presenter is tall, slim, with swishy long hair. Nice to see someone a bit different.
Oh - I love Siobhan, @Maireas - I love her style, her sparky personality - I love that she breaks the mould you have described - but her current hairstyle just isn't to my taste (but she has ever right not to ask my opinion on her appearance 
). She is definitely her own woman, and you can't help but admire that.
Her style isn't always to my taste but she in no way looks "a mess"..
I agree @SoupDragon - she wears unusual clothes, often has an unusual hairstyle, but is never" a mess".
Please let's not spoil a lovely show picking apart the appearance of the only female presenter.
Is commenting on her appearance "picking apart"? She puts herself out there knowing that people will remark on her - and she's got the bottle to break the "standard presenter" rules. She dresses for herself, not for us, and good for her. It's who she is.
Anyway, I think she's a good presenter on an enjoyable show.
Seconded without reservation.
(In the interests of sex equality, I also find Keith's suits mildly irritating, as he always looks to me as though he has just grown out of them - but that's his style, and he wouldn't be the same without it.
Richard, however, is the Mary Poppins of pottery judges - practically perfect in every way.)
Edited because I'd typed "brakes" instead of "breaks". It is almost invariably spelling or grammar with my edits.