Regularize French Tax Affairs

I left France earlier this year and relocated permanently to the UK. Before moving I sold my only French property in July, yet the full taxe foncière is still being levied and I never completed the 2025 income tax return that was due in 2026. Because I have not informed the French tax office of my departure, my accounts remain open and I risk penalties. Here is what I need: • Prepare and file the overdue 2025 income tax return, making sure the property sale and my non-resident status are reported correctly. • Sort out all property-related paperwork — especially the taxe foncière adjustment tied to the sale date — and obtain any refunds or closing statements. • Secure an official French tax residency certificate confirming that I am no longer fiscally resident in France. • Handle the formal notification to the tax authorities of my relocation so every liability account can be closed cleanly. I can provide the acte de vente, U.K. address, and previous French tax references. Please outline the steps you will follow, estimated timeline, and any additional documents you will require from me so we can wrap this up quickly and definitively.