[Spencer]

Radio 4 LW itself isn't being turned off in March/April, just the LW only programming. As far as I know no date has been set yet, mainly because the BBC isn't the only thing carried on that frequency. The electricity companies need to get their customers off their radio teleswitching and onto modern equivalents first

The Radio Teleswitch service is scheduled to end on the 31st March according to Ofgem, and all suppliers are supposed to have replaced RTS meters by this date.

www.ofgem.gov.uk 

However, I did hear the energy industry has been wanting to push this date back into 2025.