Which side should I pass other cyclists on a UK cycle path? I'm new to using cycle paths and seem to get dirty looks for riding on the left.

When driving along my usual commute this morning I saw others riding on the right and therefore passing to the left of each other.

Surely it's the same as driving? I'm also sure that the give-way markings when crossing roads are on the left.

Edit
For clarity, I am using a single off-road cycle-path as opposed to a cycle-lane.
Of course you keep left, overtake on the right and queue like a good British person at junctions!

However, there are no rules. In 2006 British Waterways, concerned at the popularity and over-crowding problems on tow-paths did a consultation to work out if they needed a 'keep left' policy. It was deemed that such a move would be unpopular and not adhered to (and certainly not policed). Therefore, if there is no keep left idea then overtaking on the right cannot be deemed to be against any code.

Most cyclists over the age of five seem to appreciate the 'keep left/overtake on the right' idea, however there are some scenarios where this goes out the window in deference to safety. Going over Kingston Upon Thames Bridge the cycle lane is two-way, but you would be a brave cyclist to stick to 'keep left' when joining the bridge to go south - cyclists heading north are wanting to join the main highway and are crossing past your path. Going on the right is the expected norm at that particular point and, with it, overtaking on the left...