Tail-warners can be of two types - active and passive. In the case of the nightfighter Mosquitos they had active radar and many interceptions began with skirt-dragging, full power and a 360 degree turn to get behind the nightfighter intercepting them. The original intruder radars had a strong rearwards lobe, the centimetric radars lacked this and a second radar was placed in the tail, the operator switching from one to the other at intervals. I expect it is in Rory Chisholm's book (he ended in charge of nightfighter intruders in 100Gp ... some stuff is in the section on the immediate postwar interogation of Luftwaffe nightfighting pilots and technicians)..
Monica was a menace, as was running H2S on the way in. This is considered in detail in one of RV Jones' books. Lindeman demanded use of H2S for bombing when centimetric radar should have been used in the anti U-boat campaign. The RAF compounded the error by flying it experimentally, with the inevitable shoot down and recovery of 'the Rotterdam apparatus', allowing countermeasures to be developed.