Colour test recommendations in the UK please?

[Quentin Waltz]

My pretty little yearling looks palomino but her mother was silver dapple (chocolate brown with white mane) and I'm not sure what colour her father was. I want to have her genetically colour tested. Have any of you used a UK company that you would recommend?
Her papers (based on her appearance as a foal say chestnut but I'm pretty sure she's not that. Thank you

 

[LostandFound]

I've only used UC davis in the US. I would guess she is mushroom or silver dapple of some sort, not chestnut based on this picture.