Hello again Ian
If your father joined in 1937 then he would have been Regular Navy as opposed to Hostilities Only personnel, and may have joined up for twelve years?? A lot will depend on precise timeframes for his various postings, so if you do not have his copy of service record which would have been handed him on leaving the navy, you may be able to find out particulars of his service by applying to the Royal Naval Disclosure Cell
That said MLs 147 and 152 were part of the 6th ML Flotilla which comprised 145, 146, 147, 148, 149, 150, 151 and 152 with ML 146 as the Senior Officer of the flotilla's boat. There are some details here for ML 150
and also an account of events in the North Sea when ML150 rammed the German E-boat S 96
There are also awards granted to certain personnel for all the boats your father served on which can be found using the Unit feature within the Awards to Coastal Forces Database
. I do have some photographs and details relating to some of the personnel from other boats in the flotilla, but as previously mentioned, a clearer sense of the timeframe for your father with each of these flotillas would help.