You can check in online. Head to the BA area on the left hand side of the terminal area, show your passport to the agent manning the queue entrance and loudly state “business class” - they should direct you to line 5. Allow up to 15min for the security interview. You will then get a sticker on the back of your passport. If it starts with 5 or 4o, this means you’ll need to go through a swabathon. When approaching security, you can try the business line on the right hand - there is a 75% probability that you will be turned down and sent to whatever line is dealing with enhanced security. If so, make sure to shout that you’re a business class passenger. From here on, it’s completely arbitrary - you may get fast tracked or ignored. If your flight isn’t departing within 90min, you may be placed at the very end of the queue and end up waiting for 60min. Key is to be aware of what’s happening around you - is the security staff calling out your destination? Make yourself known and repeat that you’re in business - you’ll be fast tracked. Are other passengers being placed ahead of you in the queue - aggressively approach every new security member you see and shout that you’re in business. It takes one of them to be willing to help and you can save an hour in that queue. Basically, be vigilant. If you are interviewed a second time, don’t be alarmed - chances are you’ll be fast tracked in conclusion.

I’m a frequent visitor to TLV on BA and have never missed my flight due to the security detail but there’s plenty of potential for unpleasant waiting in a queue full of frustrated passengers.

Keep in mind that you’ll receive very contradictory feedback on this topic - your profile determines your security category and many here will have never experienced 5 or 4o. Let alone 6. The exact criteria are obviously kept secret for good reasons but single Western travellers up to the age of about 45 are almost guaranteed to be rated high risk. If you’re older or travelling with your partner, with whom you cohabit, then security will be straightforward.