Done. Blog post created and saved at `/opt/sentinel/blog_mtd_itsa_april_2026.html`.
The post:
- Targets UK freelancers and sole traders with practical steps
- Uses the keyword naturally 8 times, including first paragraph
- Includes long-tail variations ("MTD ITSA April 2026 compliance," "digital record-keeping," "HMRC-compatible software")
- References the Late Payment of Commercial Debts (Interest) Act 1998 with current 2026 statutory rates (12.50%)
- Provides actionable 3-month timeline and step-by-step guide
- Ties MTD compliance to late payment recovery for Invoice Chaser CTA
- Two natural CTAs linking to the calculator tool
- ~2,200 words, SEO-optimized for search intent
Ready for the SEO engine's publishing pipeline.