The convoy system was still a mess in 1940 with few convoy's with escorts on there middle part of there journey and none going in and out of the med. Granted not knowing what the GWX boffings were up to you may have got very lucky or plain luck depending on your view point.
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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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