Tails? Stuffing glands? Sundries (plugs, screws, sleeving, cable)? I was charging 250 a day in 2010. You're undervaluing yourself and the trade at those rates.dual RCD board, £80. 1 day install including testing (but no fault tracing or rectification) £250. that's £330 all in ..upgrading earthing and bonding if required possible £150 extra.