I was driving to work on the motorway on the left lane. All of a suden HGV started changing lanes, if I didn't brake he would drive into my car. I wasn't in his blind spot, he was overtaking me (there was 50mph limit and no possibility for me to switch to middle lane). I'm still shocked. I had many weird and dangerous situations, but this is the worst. I remembered his reg plate number and company name, wrote it down on the first possible red light. What do I do now? Do I email company? Report somewhere else? I'm wondering if they treat such reports seriously or just say "'we're really sorry blah blah blah" and this driver won't get any consequences. Unfortunately I didn't have dashcam (my husband is buying one just now).