Wire all pages to navigation and fix broken links

- Add services, locations, and resources to footer navigation across all pages
- Update footer in 22+ files with consistent navigation structure
- Add service pages: competitive-intelligence, price-monitoring, data-cleaning
- Add location pages: london, manchester, birmingham
- Update all sitemaps (sitemap.php, sitemap.xml, sitemap-services.xml, sitemap-index.xml)
- Fix broken /contact links (changed to /#contact)
- Fix broken contact.php references (changed to /quote)
- Fix faq-enhanced.php with correct service links
- Fix london.php file permissions (600 -> 644)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

blog/articles/healthcare-research-data-collection.php

@@ -339,7 +339,7 @@ $breadcrumbs = [
                 <section class="article-cta">
                     <h2>Transform Healthcare Research with Compliant Data Solutions</h2>
                     <p>This case study demonstrates how automated, GDPR-compliant healthcare data collection can accelerate medical research while maintaining the highest standards of privacy and security. UK Data Services specialises in healthcare data solutions that enable breakthrough research while meeting all regulatory requirements.</p>
-                    <a href="/contact" class="cta-button">Explore Healthcare Data Solutions</a>
+                    <a href="/#contact" class="cta-button">Explore Healthcare Data Solutions</a>
                 </section>
             </div>