Lawyer fees
You missed a zero of this: With each lawyer's fees running to hundreds of pounds per hour, the costs of the case.
Each silk in a case like this will be at least £1000 per hour in addition the court teams will be support by a range (probably 4-5) solicitors with rates of £400 - £800 per hour.
Back of a fag packet calculation are £5000 per hour per team. They will probably all be working 12 hour days 6 days a week while in court. So lets call is £120k per day or £720k per week for the in court weeks.