Morning to you too, matey!!
Just to clarify - UK Filtering is moving between two lanes of slow-moving or stationary traffic, at no more than 40mph (where the speed limit allows). It is also allowed on the M/C test, provided it is done safely.
Any faster or with dramatic sideways steering and it's high-speed weaving, which is dangerous and illegal. Typically (and best) done by insane M/C couriers. Filtering is also applied to moving down the right side of single lanes of traffic, though technically it is overtaking and any cops who stop you for being a prick tend to view it as such.
It must be understood that you have the right to filter but you do not have a right of way when doing so, just like overtaking on a single lane - You may do so if it's safe, but if there's anything oncoming then they win.
Because there are no definitive rules, people push the boundaries on this and end up pissing other people off, crashing and riding obscenely.
Hate them, by all means. I do.
But back to the topic..... Who wants my love, then?