From when I need to start complying with GST Rules

If your annual income has exceeded the £20 lakh threshold for GST registration during the current financial year (FY 21-22), you generally need to register and start complying with GST rules immediately. This applies even if the threshold was crossed mid-year. For services provided to clients outside India, specific rules may apply, so it's advisable to confirm the exact timing and requirements with a tax professional.