No.
Due to the number of passenger seats in the vehicles the driver must have a D1 category on their driving licence.
If you passed your test before 1 January 1997 you may well have the D1 category automatically on your licence. If not, then you will need to take a test to have D1 added to your driving licence.
Please see: www.gov.uk/driving-licence-categories.
Although out minibus does NOT meet the ULEZ emissions standards we have been given an exemption until 27th October 2027
However, if you enter the Congestion Charge (CC) zone during its operating time you will need to pay that daily charge to drive in central London.
Before entering either the ULEZ or Congestion Charge Zones please check with TfL's vehicle checker: https://tfl.gov.uk/modes/driving/check-your-vehicle/