BA do indeed crew both low hours FOs and low hours on type Captains. your average BA cadet will join the company with about 180 hours, do approx 44 hours in the sim then base training. After that its 40ish sectors with a training Captain before being signed off. In a busy shorthaul fleet this could quite feasibly be just 60 hours. After that you are considered to be on a 'Consolidation line' for a further 40ish hours. Net result is you can be signed off your consolidation line with less than 300 hours total (albeit 100 hours in type and about 80-90 sectors under your belt). Not sure how long Captains are on consolidation for but I'm confident they would be clear by 100 hours. BA do not permit crew members on consolidation lines to fly together, but its quite feasible for the scenario I mentioned above to take place. By and large it seems to work well with a highly experienced Captain managing the operation and a technically proficient FO ensuring he doesn't get confused by the new computers.