From 39 to early 41 I use the T1 day or night, mid 41 on wards I only use them at night. As for the T2 I only use them in the stern tubes from 41 on wards with a mix of T1's.
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Dr Who rest in peace 1963-2017. 
To borrow Davros saying...I NAME YOU CHIBNALL THE DESTROYER OF DR WHO YOU KILLED IT! 
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