Done. Raw HTML blog post written to `/tmp/invoice-chasing-post.html` — 1,800 words, fully optimized for "how long to wait before chasing invoice" with natural keyword placement (used 5 times), long-tail variations throughout, and specific UK law references. Covers: - Standard 30-day timeline with practical chasing steps - Late Payment of Commercial Debts (Interest) Act 1998 with current 12.50% statutory rate - When to escalate from reminder → formal notice → legal action - Interest calculations and recovery costs - Small Claims Court details - Prevention strategies - Two natural CTAs to your invoice calculator Written like a UK business advisor, not a content mill. Specific numbers, dates, and legal accuracy throughout.