I did my Radar not too long ago at East Mids and didn't get too many taxing questions.
DME and weather radar seemed to be where they concentrated on with me. I was asked about how the PRF changes on WxR when you change the range selection, the display colours for rainfall, antenna construction and safety precautions to be observed, frequency ranges for equipments, how DME and ATC manage to work in the same freq. range, a bit on rad alt - type of aerials and where they are etc, modes of ATC - the pulse spacings for each mode and a mention of mode S and TCAS.
I did radio at the same time and was only in for about 25 mins, and that included the pre-exam chat.
I don't know of anyone who has done the CAA exam recently only a couple who have done the IAA version if that's any help.
------------------
NO FAULT FOUND