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I was just going to post something similar, but I'll repeat littlespark's post instead.You could add a second box that is big enough replace the fuse box, but have the spare ways blanked off. Then, in the future, move the circuits from old box to new.
The existing fusebox is in a position that is unacceptable to comply with current regs and recommendations so mount the a new one of sufficient capacity to serve the whole house in an acceptable position, preferably moving the incoming supply to feed it, and then feeding the existing board temporarily from the new, via a RCD or RCBO. If this results in this RCD tripping, then that just proves that a part of the original wiring is in a dangerous condition, and obviously this will need to be addressed immediately.
Some might question connecting the whole original board as a 'final circuit' from the new board, if this 'circuit' does not comply with modern regs., but this is where I consider a qualified electrician should be able to over rule the letter of the regs with his expertise.