I think the case with Germania is often overstated. What's often ignored in that case is Roman manpower in ruins at the time and Rome had been exhausted by the Great Illyrian Revolt-which was the only reason Varrus was in Germany controlling only 3 legions in the first place. Rome simply was not in the position immediately after Teutoburg to retaliate, and Tiberius and his successors then just found it easier to control Germany through client states. Which still merited the occasional invasion.Maybe! On the other hand, Germania.
At the very least, I think you'll see the German situation repeat itself in Britain. The Romans revert to a policy of indirect rule, but one that necessitates keeping client states in line and maintaining a power balance in their favor. Britain is more valuable economically to the Romans than Germania, so there's even more incentive here. But that's also the reason, in my view, that they would be more likely to just re-invade. Politically, the loss of Britain might be disastrous for Nero. Maybe an earlier, and more successful variation of the Pisonian Conspiracy leads to his overthrow. If it's anything like OTL, expect jockeying for the position (I don't see how someone like Piso could hold onto power) but whoever takes over, whether its Piso, Corbulo (in my opinion, the likeliest successor here) or Galba, a military victory against a foreign enemy to establish legitimacy would be a sensible move, and Britain would be a ripe opportunity.