The distinct step up of the British & Irish Cup proved too much for the talented Llanelli team.
The recent full-time professional set-up at Richmond was evident in London Scottish's approach as they stunned their Welsh opposition from the kick off.
The 'Scottish' playing with the stiff breeze on their backs scored two excellent tries from Mark Bright and Miles Mantella both converted by James Love who also kicked a penalty for a 17 - 0 lead within 27 minutes.
Against the strong wind, Llanelli were unable to get the territorial ground to really threaten the outstanding London Scottish defence (which must have delighted their defence coach Serge Betsen) despite having some good phases of play.
Owen Williams give his team a perfect start to the second half with a huge 55m penalty after 2 minutes. But 5 minutes later, another fine line break resulted in Jim Thompson scoring under the posts for Love to convert to rub salt further into the wounds.
To little and too late, the Llanelli team rallied and were awarded for their efforts with two late tries from impressive replacements Criag Hawkins and Diggy Bird, with Diggy also converting his own try to end a tough British & Irish Cup encounter.
London Scottish 24 - 15 Llanelli RFC
The return fixture is this Saturday 15th December at Parc Y Scarlets with a 2.30pm kick off. A fantastic game in prospect in the outstanding Pool 6 of the B & I Cup.