In a number of places, the AAIB report mentions "visual limitations, such as contrast and glare".
Interestingly, in the aftermath of a fatal accident in 2003, MoD stated that only the effect of direct light, not glare or reflections, need be considered in an aircraft's design. If this were still a military aircraft, those references would not be permitted in the report; although I'd like to think the AAIB would insist.