Since the Royal Navy is currently about as successful as the USS Zumwalt, we’d probably have to be rescued by the Icelandic Navy, or a few Russian tugs.
Yes, we’re travelling back in time, but it’s to the 14th century (Black Death and population shrinkage), not the 18th.
[edit - we do have one advantage over less well established navies; we can furnish every ship with a whole admiral and have some left over in case of emergencies. So much scrambled egg, so little wet steel.]
