Fernando Alonso has now sent Aston Martin a stern warning at the Spanish Grand Prix and urges the team to ‘not give up’ after enduring a frustrating Saturday in Barcelona. The home favourite will only start the Spanish GP from P10 after gaining one place thanks to Sergio Perez serving a three-place grid penalty. Alonso failed to reach Q3 for the fourth time in 10 races after bowing out in P11. He missed out on the top 10 shootout by 0.019 seconds. Lance Stroll will also start from just P14 at the Circuit de Barcelona-Catalunya after lapping it 0.244s slower than Alonso in Q2. The 25-year-old’s…