You cannot call yourself a solicitor unless you have a practising certificate.
You can call yourself a lawyer because lawyer is a generic term and you are indeed a lawyer.
The reserved activities for which you must have a practice certificate are shown below.
incidentally, if you are working in a solicitors office and you are on the roll of solicitors, even though you may not be working as a solicitor but, for example, are just answering the phone on reception, you must still have a practising certificate.
Provided what you propose to do, does not come under any of the descriptions in the above list, there is no problem in doing what you propose.
Incidentally, even the giving of legal advice is not regulated.
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