The one advantage of telling the H personally how much you need from him in the interim, is it saves cranking up more fees to sols sending letters.
Remember there is no legal aid anymore. (Shame on you England for doing such a thing. Wrong, very wrong. Justice should be available to even the poorest in society.)
Your sol will be very keen to handle it for you, but a letter to your H, £30+vat, one back and so on and so forth soon mounts up. Remember too, that a solicitor's letter bears no more weight than from anyone else, so you could easily spend and be back to square one. Better having the money to take DD on a lovely hol, just M&DD bonding time.
Don't ever spend £100 to gain £90 to score a point.
Never feel intimidated by a letter from a sol unless there is court attached to it.
All the references to Rottweiler sols mean nothing, as only a court matters in the end.
You may come to regard your sol as a friend, which they are most certainly not.
Never take any emotional baggage in to discuss at their prices, cheaper to see a therapist. All they want is an easy solution for their records and cash in the till.
So don't dismiss out of hand negotiating face to face how much you want from him. Tread softly too is my advice so as not to scare him. If he was employed you'd be safer. The SE are slippery toads.
I have one scenario in mind where he could really stitch you up. The problem with divorce sols is they have no business knowledge.
I'd say do as much yourself as possible, some sols are happy with that, only getting involved in looking things over from the legal aspect. It will make you feel empowered as well. At the least you should learn all the stages which wikivorce has on their site.
Remember when talking to the H, every word will be related back to the OW who will scream, "How much"?
Leave emotions out of it for that reason and keep it cold and business like.
She will take to using terms such us, "Our solicitor", "We received a letter".
No you didn't Bat, it's his divorce, not yours!
Sorry my advice is all over the place. Writing as it came back to me.