Skilled worker dependent visa - Vignette Transfer

Dear Board,

I hope this message finds you well.

I am writing to seek guidance regarding my family's situation with their Skilled Worker Dependent vignette (passport sticker), which is valid until March. Unfortunately, due to some family commitments, they haven't been able to travel to the UK as planned.

I'm considering applying for a vignette transfer https://www.gov.uk/transfer-visa. However, I have a few questions and concerns that I hope you can assist with:

Timelines for Transfer Visa Submission: Are there specific deadlines or timelines we should follow when submitting the transfer visa application? Is there a certain timeframe within which it needs to be submitted?

Approval Process: Since the initial visa was approved, can we expect the transfer visa to be approved automatically? Or are there specific criteria that the visa officer will review when considering the transfer application?

Vignette Validity: Do we get new vignette again valid for 90 days ?

I couldn't find the full terms and conditions regarding vis transfer, any reference links you can share please ?

Your expertise and guidance in this matter would be immensely appreciated. Thank you for your assistance.

Warm regards,
kb

Taken from an immigration site

Here is everything you need to know about a Vignette Transfer!

So, you couldn't arrive into the UK during your 30 day clearance due to unforeseen circumstances and now you are not sure what to do?

What will happen with the entry vignette (30-day entry clearance) and your UK visa once the entry vignette has expired?

Rest assured that your visa is not going to be cancelled, and that you are not the only person who had faced this dilemma before.

When an entry vignette expires, the visa holder is eligible to apply for a Vignette Transfer to receive a new entry vignette, and therefore a new 30-day window to enter into the UK. Please remember however that the visa end date will remain the same as stated in the original visa approval letter. The new and old vignette is merely a 'pass' to enter into the UK for a period of 90 days, when you then collect the actual visa - which is called a BRP card. BRP stands for British Residence Permit and this card looks similar to a driver's license.

What is involved with a vignette transfer?

You need to apply for a new vignette sticker with a new entry date into the UK
The cost for the application is £154GBP
You will need to attend another Biometric Appointment in your country of residence
You may not be allowed to apply for the vignette transfer in another country if you do not hold a valid visa for that country, basically you to legally be allowed in that country
Once again, your passport will be sent away for processing at the Biometric Appointment
Processing a vignette transfer can take between 15-20 business days (or you can opt for priority service with the UKVI at an extra cost, and the vignette should be processed between 5-10 business days)
You can only apply for a vignette transfer if your travel date is inside 3 months from the application date
The expiry date of your visa will NOT change

The basic rules for transfer are - you have not traveled - obviously.
The intended travel is after the expiry of the vignette and within the date of the expiry of the visa granted.
For dependents there is not a window / timeframe that you have to meet for the vignette transfer as long as it is before the expiry of the visa granted. For skilled worker lead applicants there is an additional requirement that the sponsor should update the SMS with a new start date.