I was in France earlier this month with the Family. I now have the photographs off of their camera. Here they are with comment. Would these have been better ideas for Western Esplanade?
Here's a lane similar to Southend's. There is little need for this to be two way since it's on a one way street and cyclists actually have problems continuing their route at either end where they have to cross this traffic lane if riding with the flow of traffic. The key point to note is that the lane is flush with the carriageway and only defined with paint. This makes it safe to enter and leave. Southend's low kerb does not prevent vehicles entering the cycle path but does prevent cyclists from doing so.
Here's a lane similar to Southend's in that it is two way between the road and pavement. Please note that it is wider, so useable. Please also note that the kerb is chamfered so that if a cyclist rides into it they will rise onto the pavement instead of being unseated and falling off the bike. Most importantly please note the concrete barrier preventing vehicles entering the lane.
Here's a much more aesthetic approach to the barrier. The road and cycle path are safely separated, as is the pavement. Also note how the zebra crossing extends across the cycle path; cyclists still have to give way to the pedestrians, but without the hazard of give way markings and belisha beacons.
Outside of town this path was found. Note how easy it is to use by a large number of cyclists, and how the lead cyclists are weaving in their enthusiasm to wave at the camera. This is not possible on Western Esplanade.