unfortunately if ebay staff will find it, they'll remove that listing. You can give phone number or email but you're not allowed to link from ebay to any online sales website.
So the smartest move is to include on your ebay listing:
- phone number
- alternative email address which is including your website domain, i.e. [email]sales@xpres.co.uk[/email]
- your logo (graphic) which can include your web address
