 When James died in 1761, George inherited both the baronetcy, Gatton Park and the Lordship of the Manor at Gatton with its guaranteed control of one of the parliamentary seats there.He had Gatton Park landscaped by Capability Brown between 1762 and 1768

More valuably, however, Colebrooke's support for Newcastle ensured his eligibility for lucrative government contracts.By 1762, he held two of these contracts, one for remitting money to the British forces in the American colonies and the other for victualling the troops there.