We need to output JSON with fields: seo_title, summary, key_entities, expert_faq, internal_link_anchor, primary_keyword, secondary_keywords, content_type.

Constraints: summary must be 180-250 words, split into 3-4 paragraphs separated by double newline. Each paragraph 45-65 words. Must bold a few key details using double asterisks. Must be selective: 3-5 bolded terms across entire summary.

We need to extract info from source: British GP record crowd ~180,000, Hamilton fears Antonelli will disappear, Hamilton in Ferrari, Russell, Norris, Antonelli on pole with Leclerc, Hamilton lost sprint to Antonelli, etc.

We must not invent facts. Must only use info from source. We'll need to bold maybe Lewis Hamilton, Kimi Antonelli, 180,000, Silverstone, Mercedes? But we need only 3-5 bolded terms.

Let's decide to bold: Lewis Hamilton, Kimi Antonelli, 180,000, Silverstone, maybe Mercedes. That's 5.

Now we need to write summary 180-250 words, 3-4 paragraphs each 45-65 words.

Let's aim for 3 paragraphs, each about 55-60 words => total ~165-180? Actually need 180-250, so maybe 4 paragraphs each ~55 => 220. Let's do 4 paragraphs each ~55 words = 220.

Paragraph 1: talk about record crowd and home hopes.

Paragraph 2: talk about qualifying results, Antonelli pole, Hamilton concerns.

Paragraph 3: talk about Hamilton's sprint experience, his remarks.

Paragraph 4: talk about Norris/McLaren struggles and context, concluding statement.

Need to end with concrete statement, not forward-looking platitude. So final sentence should be something like "Antonelli’s pole position leaves Hamilton facing a steep climb to a record tenth British GP win." That's concrete.

Now ensure bolded terms appear.

Let's draft.

Paragraph 1 (~55 words):

"A record crowd of close to 180,000 fans is set to fill Silverstone for the British Grand Prix, hoping to see a home victor. Lewis Hamilton, driving for Ferrari, George Russell of Mercedes and McLaren’s