1: Inform LABC
2. Contact DNO and arrange for them to fit isolator / pull fuse
3: Change board
4: Inform LABC that you have finished and get them to test
5: Energise!
You need to inform your LABC before you start the work, and then they will arrange for an electrician to test your work for you when it is complete.
WRT the DNO, it will be easier for you if you request that they install a DP isolator, and then they will only need to make 1 visit to your property, which will save you a bit of hassle, and possibly a duplicate fee.
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