Production Release Changelog

We publish an auditable, reverse-chronological record of all computational engine releases, statutory tax band adjustments, accessibility updates, and performance optimizations.

Production Version 1.1 — October 2026

Primary Deployment Focus: UK Property, Stamp Duty (SDLT & LBTT), Mortgages & Leasehold Cluster

  • Launched 10 Statutory Property Calculators: Deployed Mortgage Overpayment Calculator UK, Stamp Duty Land Tax (SDLT) Calculator, UK Mortgage Repayment Calculator, Buy-to-Let Mortgage & ICR Calculator, Land and Buildings Transaction Tax (LBTT) Calculator for Scotland, Lifetime Mortgage Equity Release Calculator, HM Land Registry Fee Calculator, Statutory Leasehold Extension Cost Calculator, UK House Price Index Valuation Calculator, and Commercial Property Mortgage Calculator.
  • Statutory Verification: Calibrated progressive SDLT rates under HMRC guidelines, LBTT residential bands with Additional Dwelling Supplement (ADS) under Revenue Scotland, and HMLR Scale 1 & Scale 2 registration fees.
  • Amortisation Mathematics: Integrated client-side monthly compounding schedules with Early Repayment Charge (ERC) threshold tracking and annual 10% penalty-free overpayment logic.
  • Client Memory Optimization: Implemented bounds-checked sessionStorage and query parameter hydration with instant history sanitization.

Production Version 1.0 — October 2026

Primary Deployment Focus: Core Architectural Framework, SSG Engine & Foundational Governance Pages

  • Core Platform Infrastructure: Deployed static site generator (ssg.js) synchronizing single-source navigation, WCAG 2.1 AAA high-contrast theme, and Apache performance configuration (.htaccess).
  • Author & Systems Authority: Anchored David Miller (@davidmillercoder) verified developer profiles across JSON-LD schema, footer architecture, and primary governance dossiers.
  • Foundational Governance Suite: Built About Us, Contact, Methodology, Accessibility Statement, Editorial Guidelines, Privacy Policy, and Terms of Use.
  • Security & Crawler Access: Configured 14-bot robots.txt whitelist and validated sitemap and llms.txt sync.