I'm saying that, especially in dialects with dark ls, an l-colored /æ/ can be an [a], just like an l-colored /u/ can be a [ʊ] or an l-colored /ʌ/ something closer to [o].
No, I'm not saying it's improper. In fact, I can imagine that they might be little villages tucked away in Britain somewhere where everyone says /ga:ləksi/. If the TV advertisement was filmed in such a village, then that would explain it. Hence the question about context.