Wanting to have a weeks holiday abroad with good xc riding for me and horse riding and walking for the wife. Any recommendations from anyone who has done something similar.

Ciclomontana, the best trails, some good walks in the Sierra Nevadas, and I know there are places that do horse riding in that area.
Give them a call/email.

Morzine has all three in abundance. Probably quite a few things you can do together as well, eg pool/spa and ice skating in the evening.

I´m confident that you will not find better trails, scenery and weather (on mainland Europe, http://singletrackworld.com/forum/topic/january-mtb-holiday refers)in the Sierra Nevada, here in Andalucia with http://www.bikingandalucia.com, and also excellent value.
Also horse riding close by at Lanjeron with

Horse Trekking and Horse Riding Holiday’s in the Alpujarras, Andalucia, Spain!

There are rules about advertising in the classifieds. Seems to go on in the other forums unnoticed.

Whistler – http://www.ticket2ridebc.com

Adventure capital of the world!!!