Another thing, I have been reading about pre arrival letters on the thread alot. And from what I have read it is usually sent out after sponsor eligibility check done, medical passed and biometrics given.
But in our case Sponsor eligibility was approved in first week of December, Medicals and biometrics were done and updated in first week of January but never got any Pre Approval letter.
And It's been more than 4 months since last update we haven't heard a thing

.