Speed Limit in Bike Lanes?

lol. That was my response. Feel free to use it any time this occurs. https://rate-driver.co.uk/HG09FOJ

or as suggested, just say its too dangerous at my speed, im not a toddler on a tricycle. Or ''yes the bike lane is lovely, why dont you sell your car and buy a bike to use on it instead?''      

i thought sustrans said its reccomended to max ride 18 mph on shared path but thats not the law, i dont think there is a speed limit for a bicycle on such things. 

People seem to be talking about different things:

Cycle lane - part of a road reserved for the use of cyclists: strictly speaking, the speed limit would be whatever the speed limit for the rest of the road is, but since limits aren't enforceable on cyclists and no-one else should be using them, effectively there is no speed limit; it's probably sensible to suggest that if you think you might be exceeding you should maybe knock it back a bit though.

Cycle track - separate facility reserved for the use of cyclists: there are no speed limits.

Shared-use path - where cyclists are permitted to use some or all of a space also used by pedestrians: no speed limit, but advice has been issued in the past that you should consider using an alternative route if you wish to travel more than (I think) 16mph. Also, pedestrians have priority, even if they are in an area that has been specifically designated for cycle use (e.g. white dividing line and cycle symbols), and you should give way to them.

to have a speed limit, first we would need to be required to have a method of measuring speed. hence it is an offence in a motorised vehicle it is an offence for the speedo not to be working. 

I did recently see a stripped back old Honda cub being MoTd that had a Garmin on the handle bars (and it passed  

No. Don't go down that route, or you'll have some local newspaper out with 'Lycra clad Tour de France wannabe too fast in cycle lane'. 
 

In the Land of the Free they already radar gun mountainbikers.

My usual response to that question is "I'll use the bike lane when you promise to only travel on Motorways".

Make it up. 10 mph perhaps.

If the motorist is too ignorant to know that cycle lanes are optional and frequently have wandering pedestrians, dog lead garotting devices and broken glass, they're unlikely to try to find the truth and even less likely to understand and remember it. So you'd only be giving them a handy rule of thumb, not a spin doctor standard economy with the truth.

And truth is in short supply so don't be using it recklessly and wastefully.

I think there used to be some vague guidance about 15mph being the speed limit, but it's not legislated at all. 15mph sounds like a reasonable speed, so if you're going quicker then it's best to stick to the roads (despite what Welsh boy says).

It's probably best to not respond to intolerant motorists, but you could always say that you don't want to run into any children using the cycle-path and that you hope the motorist is as considerate to vulnerable traffic and pedestrians.

There is no law (that I am aware of) which says a bike has  to use a bike lane, it is a vehicle on the road the same as any other vehicle.  There are certain restrictions placed on certain classes of vehicles (mopeds, horses and bikes and motorways spring to mind) but please dont kid yourself that you are too fast to use a bike lane