We overview the momentum space equation of high energy factorisation in particular focusing on the BK the CCFM and KGBJS evolution equations. The recent developement was motivated by the regime of QCD explored nowadays at LHC, where both the total energy of collision and momenta transfers are high. In order to study such effects like parton saturation in final states one is inevitably led to investigate how to combine physics of the BK and CCFM evolution equations. The new exclusive form of the BK equation suggests a possible form of the nonlinear extension of the CCFM equation i.e. the KGBJS equation.