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I've hit a bit of a dead end, I thought replacing those switches with timer/booster switches would be straightforward and it was just a question of identifying which wire goes where, but it seems like there is more to it than that. I'm going to have to call in the heating engineer I've used...

It's not that there is no neutral, it's just that they don't seem to be wired to these switches, which effectively seem to just on/off the live feed to the boiler/water pump for the Water switch and boiler/rads pumps for the heating, presumably the neutrals are connected directly, outside the...

OK, I've tested everything with the multimeter, and established that there is a link between the hot water switch and the heating system switch. I mapped which wires are live depending on which switch is on or off, it's in the scanned sheet. Now to work out which to connect to the L(in)...

Thanks for the replies everyone, I'm going to read them closely tomorrow while looking again at the switch(es). There are actually two. It's a crude arrangement given how modern the house is (10 years). There is an oil boiler. There are two switches. One for the hot water, one for the heating...

I have an existing simply DPST switch that operates the heating, firing up the oil boiler and also turning on the pumps to circulate the water in the rads. I'm trying to swap it out for Boost-button timer switch. The existing switch, aside from earth, has L1 & N1 and L2 & N2 connections. As...