Welcome Jamie296 
Convoy lights with the 12-mode driver can set to single mode only, i don’t know if any of these come with charging capabilities though so hopefully someone with more knowledge of their lights might chime in.
As you’ve used the ‘£’ symbol i’m going to assume you’re UK based, in which case Eagtac lights might suffice and are available from Flashaholics.co.uk
I have Eagtac lights and like them, but i don’t have any rechargable ones so have picked a couple at random that might fit your criteria:
Eagtac PX30LC2-R
I’ve no experience with this UI but Eagtac’s online site states the following:
Basic operations:
Turn on the light at MAX output by pressing the tailcap button until it clicks./li>
Turn on the light at LOW output by holding the side switch button while pressing the tailcap button until it clicks.
Advanced operations:
For momentary on function, slightly press the tailcap button
To switch between different brightness levels, press the side button switch w/ flashlight on
To enter hidden auxiliary mode, press and hold the side button switch for 3 seconds w/ flashlight on
which sounds like you just click the tailcap button to turn the light on in full mode, and then off again.
There’s also the Eagtac S25V which just uses the tailcap switch to turn the light on and off, mode settings are detemined by rotating the head. I have Eagtac light with this UI, basically if the head is fully tightened you’re in max mode so if you leave it like this - job done.
If you loosen the head a little bit (up to a quarter turn) you’re in medium mode, loosen a little more and you’re in low. Basically, wherever the head is twisted too determines the brightness level regardless of whether the torch is turned on or off at the time.
There are programmable options so you may need to spend a little time setting it up (such as double click turning on strobe) but once set it’s just on/off with the switch.
There are other lights and UIs, such as the SX30C2, which you may also like but i think it would be useful to understand what kind of beam pattern you want before recommending anything.
The two torches i link to above have different beam patterns but are both quite throwy, you’d struggle to use the S25V close up, in max mode it would be blinding and could damage your eyes.
In fact both have this potential close up in max mode.
Do you use your Ledlensers in flood mode or distance mode? Or are you looking for a zoomable torch?