Never knew that - have you gotten an exemption to go beyond the CAP371 targets?
BA don't operate using CAP371. They have their own approved Scheme with some differences (for example, the number of earlies which can be worked in a row is greater than CAP371). The 100hr/month and 900hr/year limits are the same though. On longhaul, many of the guys are on restricted rosters as a result of hitting the 900 hour limit. On shorthaul, it's more difficult to hit the 900hr limit but at both bases, a running total of greater than 800 hours is common. The restrictions on shorthaul tend to be duty related rather than hours related.
That's not to say the company haven't applied for exemptions in the past. There was a request a couple of years ago for 100hr/month for twelve months and the CAA objected. No doubt we will see them trying to push of LH bunk time to be discounted from the total again. Can't see that happening in a hurry either.