Yes, the maximum cash deposit allowed will be GBP20,000 (including a maximum of GBP250 for coin content), whereas the maximum cash withdrawal limit will be lower at a maximum GBP500 (or the individual Business Debit Card limit if lower). It should be noted that only Main Post Office® Branches will be enabled to operate up to the higher deposit limit, with the smaller Post Offices® only able to accept GBP4,000 deposit.
For change-giving, the maximum cash exchanged [note/coin swap] is GBP2,000. Please note that only Main Post Office® Branches will be enabled to operate up to the higher cash exchange limit, with smaller Post Offices® only able to swap GBP1,000. Each Post Office® will be able to advise you whether they are deemed a Main Post Office® or not.