I am not familiar with Sky email.
Check in your various options, actions, etc. If Sky can export contacts to vCard format then you can email that file to yourself on the iPad. Once it arrives tap and hold on the attachment in Mail and it will give you the choice of importing it into the Contacts app.
It may be possible to import a .csv file this way. I'm not sure. I've never tried.
If it won't, then you can get a Google account. It will import .csv files, and you can sync your contacts from Google (or export as a vCard if you don't care about syncing). You need to set
Google up as an Exchange account to sync contacts.
If Sky is an email provider/website, then check their help forums to find if they have an LDAP or CardDAV server (few do, unfortunately). If they do you can try syncing your account directly with the iPad. You add the account under Settings > Mail, Contacts, Calendars > Add Account > Other > Contacts.