110mm into access chamber when no spare inlets

[Mattg4321]

Following on from the other topic I just posted, it would really help if I could connect to an access chamber (300mm) the same as in the picture (note it's not this one!) There are no spare inlets, can I create one in the riser somehow? Note that this is surface water, not foul. It would be a connection from an aco drain.

[Mr Punter]

If this is just surface water you can pretty much do as you please.

[Oz07]

Just y off an existing branch 

[Mattg4321]

13 minutes ago, Oz07 said:

Just y off an existing branch 

It's an option, but more hard work than connecting directly into the access chamber!