No. The rules apply to what can be sold and supplied, not to what you already own. The full explainer covers existing stock in detail.

This is the question with the most nuance, because the two Great Britain dates do different jobs. The full explainer walks through it properly.

No. 30 to 60 seconds in a standard UV or LED lamp, exactly as before. No new equipment and no change to your routine.

No. Same pigments, same shine, same wear. The photoinitiator is swapped and nothing else about the finish changes.

No, they are different ingredients doing different jobs, and only TPO is being prohibited. Many Semilac products are free from both.