There were limits on the use of large aileron deflexion at certain speeds and 'g' loading, but those weren't exceeded in this case.
However, in the 1977 Claerwen reservoir accident, it is probable that high 'g' and roll rate resulting from violent manoeuvre to avoid a collision may have caused structural failure.
Others will know better (and it was nearly 40 years ago), but I recall being briefed to use no more than half aileron above 400KIAS if pulling more than +4g?
The Buccaneer was immensely strong - one pilot became disorientated during a night toss attack at Wainfleet and pulled well over +11g during recovery having first rolled wings level. The AAR probe was bent and both flaps fell off, but he got it back safely to Honington.