This section applies where—
Except as provided by subsection (3) below, the Court may in respect of any related offence of which the appellant remains convicted pass such sentence, in substitution for any sentence passed thereon at the trial, as they think proper and is authorised by law ... .
The Court shall not under this section pass any sentence such that the appellant's sentence (taken as a whole) for all the related offences of which he remains convicted will, in consequence of the appeal, be of greater severity than the sentence (taken as a whole) which was passed at the trial for all the related offences.
For the purposes of subsection (1)(a), two or more sentences are related if—
Where—
all the sentences are to be treated as related for the purposes of subsection (1)(a).