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OK, MikefromLondon, here is my attempt to draw your proposed solution (with optional capacitor shown for completeness). Have I got this right? BTW, I find AutoCAD LT very useful for this sort of thing. As they say, a picture is worth a thousand words...

Actually, I thought it was impossible to wire the pushbutton with just two wires. The attached diagram shows how I had assumed it needed to be done. This version ensures that the LED stays lit at all times.

I am a bit puzzled by that question. I have never seen a bell button that was not a push to activate and release to deactivate, i.e. non-latching, and have no reason to believe that I have just bought anything different. Surely no one would want any possibility of a bell being left to sound...

My bell transformer is as shown below. The specs state clearly that the nominal output is 8v AC. I have also confirmed with my ancient multimeter that there is no significant DC output. The no-load output is still 16v AC. However, our mains voltage is at the legal maximum of 254.4v (240v + 6%)...

It does indeed simply say 12V. The supplier's rather limited installation instructions also state "The voltage range for the LED is based between 8 and 12 volt. You can use either continuous or alternating current. Both are possible". Elsewhere in those instructions it says "You will need a...

Let me also correct a misunderstanding by ericmark. Finding a 12 volt DC LED power supply is not my problem. I have already identified the following item as appearing to be an exact match for my needs. However, I don't wish to introduce added cost and installation complications if they are not...

Many thanks for all the rapid and useful responses so far. I have attached a couple of photos that show the sort of illuminated pushbutton I am talking about. The circular LED-powered light is white. I'm not sure if there is any way to dismantle it and replace a blown LED, so I am not planning...

I have bought a rather classy and expensive engraved stainless steel bell push fitted with a Bulgin-style pushbutton that has an integral LED rated at 12v DC. I would want the LED to be lit at all times (except perhaps while pressing the pushbutton). It has been difficult to get much...