Two routes: visa-exempt nationals (most of the EU, USA, Canada, Australia, Japan and others) must hold a UK Electronic Travel Authorisation (ETA), about GBP 16/USD 20, valid 2 years with stays up to 6 months; visa-required nationals (e.g. India, China, Nigeria, Turkey) need a UK Standard Visitor Visa, about GBP 127/USD 160 for 6 months, typically processed in ~3 weeks. Trade-fair attendance, stand meetings and contract negotiation are permitted visitor activities; carry your registration or invitation letter. Confirm on gov.uk before booking.
Estimated cost: Varies by visa type and nationality (check official site).
Processing: Varies by nationality; apply several weeks before travel.
UK ETA fee is GBP 16 (about USD 20), valid for 2 years or until the passport expires, and permits stays of up to 6 months. Apply before booking non-refundable travel. UK Standard Visitor visa fee is GBP 127 (about USD 160) for a 6-month visa. Attending a trade fair, negotiating and signing contracts is permitted; paid work in the UK is not. Carry your invitation letter, stand contract or registrat
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