Cash Rates

Hi Guys
We have a client (married couple) with £10m currently in cash deposits and I have been tasked with trying to source them a better interest rate.
We have access to Deposit Sense so I will be using that to help, however does anyone know if any of the private banks or DFM's will offer a bespoke cash rate for larger deposits?
Peter
We have a client (married couple) with £10m currently in cash deposits and I have been tasked with trying to source them a better interest rate.
We have access to Deposit Sense so I will be using that to help, however does anyone know if any of the private banks or DFM's will offer a bespoke cash rate for larger deposits?
Peter