Went to Lion & Lamb a few weeks back for craig richards and radioactiveman, a lot of amazing electro played. Drexciya and affiliated are the obvious starting point for deeper serious stuff. For UK stuff 'deeper' through the 90s means IDM, so obv aphex, autechre, the artificial inteligence warp compilation is a good start. There's also loads of amazing stuff on the less serious side getting into 00s electroclash but not full trashy tripe. Ivan smagghe's suck my deck mix, radioactiveman fabric mix. The best deep electro song is drexciya digital tsunami , followed by bike by autechre, followed by the first one on analogue bubblebath 3