Out of interest and though I don't fly anymore, I ALWAYS used to make all the calls ie request transit, entry and departure plus any position calls I thought relevant/necessary when the MATZ was not active. I am aware that the MATZ freq may are "monitored" by other RAF controllers who, from time to time, will answer and the MATZ at an operational airfield may be reactivated at short notice, however unlikely that may seem. On top of that it helps to give others better situational awareness. As others have said, nothing to be afraid of, go for it.