Lets start at your first post - your are moving a stove point? Why does the breaker need to be changed? If you are just moving your stove - seems like some chasing and wiring? If you are however installing a new one, different connectors, and different regulations (there are regulations around stoves -some of those old Defy ones were 3-phase

) then perhaps a valid concern by the electrician - but seems extreme to rewire a DB to move 1 appliance.
On the other hand - if the db is giving issues or the rest of the wiring is as old as the DB - perhaps a re-wire is in order - every 30-40 years - sure can happen, but it will cost you a pretty penny.
No mention of any other renovations - but in this day and age, a lot of people are looking into some form of solar etc - if that's on the cards, perhaps use the same opportunity to work with a qualified installer and electrician to plan a bit ahead.