My Solicitor had not been informed of the changes by the Court or my wife's Solicitors
My wife's Solicitor asked for the Hearing to be moved.
In which case the solicitors acting for your wife should be asked to bear those costs as they should have advised yr own solicitor.
Even so, £3500 for hearing which didn't take place is expensive. I would certainly query the make up of the amount.
Can I help further?