Even if you have a dormant company, you will be sent communication from Companies House and HMRC.
You can file dormant accounts but there is no way to tell Companies House that you do not wish to receive correspondence. Companies House and HMRC will continue to send out notices to file accounts, confirmation statements and returns every year. If these are not accepted at your company address then it is only a matter of time before action is taken against the company and possibly the company directors.
Companies House will allow you to opt-in for email communication which should prevent most notices being posted to you.
In summary all UK companies whether dormant or active must have a registered office. Without an effective address your company may be removed from the register.