This answer will explain what a domain watcher is and how to set one up.
A domain watcher is a useful tool available from 123-reg. It monitors registered domains until they are available to purchase again. If a domain name you want is already taken, 123-reg can create a domain watcher to actively watch the domain and alert you should it become free.
How to set up a domain watcher
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In the Domain names section click on the Domain watchers option.
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Choose how many domain watchers you'd like to purchase. Each domain watcher costs £15 + VAT per year. If you buy 10 domain watchers we'll give you one free.
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Confirm your credit card details.
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To complete your order, click the Buy Domain Watchers Now button.
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You will now be able to configure your domain watcher through the Domain Watchers link.
Please note: There is no refund for this service should your domain name not become available.