Long-haul business class fares to the Gulf and South Asia don't follow the same "book 6 weeks ahead" logic as economy. Airline-specific sales and shifts in corporate travel demand matter more than your booking window, so it's worth checking fares periodically rather than assuming an early booking guarantees the best price.
The practical tactic is to watch a route rather than snapshot it. Check the same route and rough dates every week or two and you'll quickly learn what "normal" looks like for that pairing, which is the only way to recognise a genuine sale fare when one appears. Widen the comparison too. The same cabin from a different UK airport, or via a Gulf hub instead of direct, can price very differently for the same trip.
Business class earns its premium most clearly on long, single-sector flights, where a flat bed changes what you can do on arrival, and least on itineraries where the long leg is short or the cabin is only marginally better than premium economy. Mixed-cabin bookings, where the short leg is economy and the long-haul leg is business, are worth pricing before you assume all-business is the only way to fly it.