Hello my name is ***** ***** I will help you with this.
How do you work out the £400 please?
In reality you can't claim that. You can issue a counter claim for the rest. If you wan to see interest and £300 then that is ok.
The court fee for counter claim is £35 if via money claim online
You cant charge £100 per hour because this is a small claim (£10,000 or below). Legal fees cant be recovered as such.
Does that clarify?
Great. All the best.