[ophic]

No, they are responsible, if it can be proven that they caused you to drop your bike.

I've been fighting a case exactly like this for over a year and it seems like I'm going to have to settle 50/50 as it's basically my word against his. I'd imagine if I had hard evidence eg video it would be different.

Basically even though there is no contact, there isn't really much excuse for poor or non-existent observations, non-observance of the highway code and violating someone else's right of way. But you need evidence.