Soldato
For a start get rid of the bloody RCD's and get some RCBO's. Yes it costs a little more but it stops 1 circuit taking out another 5 or 6 circuits.
We might not think its a technically elegant solution, but dual RCD boards are the de-facto way of providing RCD protetcion in line with BS7671:2008 in a domestic environment at least at the moment. RCBOs have come down in price, but they are still around £20-£35 a pop for the likes of wylex boards, etc, cheaper chinese three letter brands are often a little cheaper but its best to stick with known brands, at least you'll be able to get spare breakers in 5 years time. Given the choice between a dual RCD split and all RCBO most households go for the former on cost reasons!