"Neutral wire required"!
There are two main ways of wiring a lighting circuit:


The wiring for the circuit goes to the switch. From there a live and a neutral are teed-off. The teed-off live is switched, and teed-off neutral unswitched, and then run from the switch to its relevant light fitting.
The wiring for the circuit goes to the light fitting. From there a live and a neutral are teed-off. The teed-off live for that fitting is then run to the switch and back, the teed-off neutral connects directly into the fitting. - This is the setup you have


It sounds like the new switch you've bought requires setup 1. There is absolutely no problem mixing these two setups. You could run a new cable from the fitting, taking the live and neutral together to the switch, and get rid of the existing cable to the switch.

Running the new cable may or may not be easy. In my house I can access the light fitting from above, as its in the loft. I can then find where the cable drops down into the wall to reach the switch, and feed a new cable through there (or tie it to the existing cable and pull through).