It just means they are checking other offences of a similar kind and seeking CPS advice.
It is literally what it says.
Linked offences could mean anything. It could mean offences of a similar MO or a DNA search or a fingerprint hit.
The reality is that unless it is a sexual offence though they won't be doing anything other than taking CPS advice.
Sex offences are sucking up all the money that they have at the moment.
Can I clarify anything for you?
They may do but not always. They don't have to but sometimes they will.
Did you need a phone call?
Can I help with anything else?