Variegation is often caused by damage to the young leaves or viruses as well as genetic mutations. As they are seed grown it's less likely that it's a virus but not beyond the realms of possibility. It would be interesting to see the plant to see what might have happened.

Were it me I'm not sure I'd be handing over my precious plants to T&M, I think I'd find someone else! *G*

There are a number of nurseries/horticulturalists who may be interested should the variegation not be viral and come true from seed or successfully propagated vegetatively. There are even a couple of places specifically interested in native plant annomalies. These places tend to get many contacts from gardeners who've found something different in their garden and the tests can make it a slow process if yours is selected.

I'm sure there are other members here who have some ideas or thoughts on this too.

I'll be honest, I've not found any references to natural/non-viral variegaton in P veris but that's not to say it's not possible. I'm still leaning towards a possible virus explanation but I'm not an expert by any means!

Here's a link for the National Auricula and Primrose Society which may have some more information or contacts http://www.auriculaandprimula.org.uk/

Below is a link to the NCCPG, there are two National Collections for Primula (Section Primula) and one for Primula (British Floral Varients). you may have to run a seach for a national collection from the NCCPG site as it doesn't always come up with the page. I've had brief contact with a few National Collection holders and can happily say that they are very knowledgable and enthusiastic about their subject and many are very helpful.

If you do get an answer and have the time and inclination, I'd love to know what the experts think :)