IIRC Sian has spent time with Cheryl too. She is indeed a lovely lady and I've heard nothing but good feedback about her coaching.
A few years ago I was reffing one cold drizzly winter day and I was struggling to separate the damp score cards with wet fingers. Cheryl's hand reached past and just slid the top card off for me. Brilliant.
Bear in mind she's a multiple world champion and at the same time one of the most courteous and well mannered competitors I've ever come across.