The invention relates to compounds of formula (I): or a pharmaceutically acceptable salt thereof, including all stereoisomers, tautomers and isotopic derivatives thereof, which are inhibitors of p38 mitogen-activated protein kinase enzymes (referred to herein as p38 MAP kinase inhibitors), particularly the alpha and gamma kinase sub-types thereof, and their use in therapy, including in pharmaceutical combinations, especially in the treatment of inflammatory diseases, including inflammatory diseases of the lung, such as COPD.