John

Thanks for the replies. I think i have got this sorted. The mcb supplied both the immersion and the garage. Im going to put the immersion on the mcb side only and use my rcb with 32a mcb for the garage. I think im going to use an rcbo for the sockets upstairs though so that things like morning alarms are not lost if the main rcb trips out. The more i think about it i really like the idea of rcbo's for everything needing an rcb (yes i know it costs a lot more) but the idea of single failures is more appealing than losing the lot on a trip.