Thanks everyone interesting to read all the slightly different opinions - having looked at all the replies my proposal whilst probably OK is after some thought
not a nice or elegant solution so back to extra dedicated CU for the outside supply (extra hassle with supply company and access to...
My house has two immersion heaters (two separate tanks), each heater with its own circuit and 16 amp mcb on the consumer unit. I have no more spare spare outlets left on the CU and need one to run an outside supply.
Can I combine the two immersion heater circuits on to one 32 amp mcb...