Is it a breach of a non molestation order when...

[Gruffalochildren]

Both parties are represented and the abuser contacts my solicitor directly instead of going through his?

Depends on the terms of the order.
Your sol will tell you.

The order says to not contact or indirectly contact me, my solicitor didn't say anything about it at the time.. But just thinking about it I wondered if it was a breach.

depends if he was trying to contact you or not I should think-
did he write- Dear OP's solicitor, please tell her I know where she lives
or did he write
Dear OPs solicitor, I wish to discuss the contact arrangements decided on by court

He rung my solicitor asking about contact but this was before we were due to have our fhdra hearing, my solicitor told him not to contact her as he is represented and he shouldn't be contacting her directly.

No, that's not a breach.