If none of your lights are working, and you have changed the fusewire, i don't know what the trouble is. It might be that a loose connection, e.g. in a ceiling rose, has burnt out or come loose
Test the cables at the first rose for a start. I gather you have an old Wylex "Standard" consumer unit with rewirable fuses. If it is a brown one it may have permanently live terminals on the main switch inside that you can touch even when it is switched off, so best not to remove the cover. It may be time for you to ask friends and neighbours if they can recommend a local electrician.
Check all your other fuses just in case the lights have been put on a fuse that is not marked "lights" with white spots on it.
However:
How to locate the supply cable, if you have a multimeter:
(Assuming you have supply to the ceiling rose)
Set your meter to AC volts in a range that includes 250v
Plug in the probes as per instruction sheet
If you put one probe on the black, and one probe on the red, of a cable, and get approx 230c AC, then that is your supply cable.
Turn off the power, and with the meter still set to AC Volts, test all wires to make sure they are dead. then, set your meter to low Ohms, or Continuity, or 200 ohms or whatever the lowest resistance scale is. Put the light switch to the "on" position. Test across the red and black wires of each cable. When you find one with very* low resistance, turn the switch to the "off" position If the resistance then increases to approx infinity (or "continuity" indicator goes off), but returns when the light switch is turned "on" then that is your switch cable. (* if you test a cable that has a light bulb connected to it in another room, you will get continuity, but at a higher resistance, and it will not go on and off with the light switch. however it will go if you take out all the light bubs)
Any other cables you find are likely to be supply to the next ceiling rose (you can verify this by connecting to your already-identified Supply cable, and carrying out the same set of tests at the next rose). Sometimes there will be more than one other rose fed from the one you are looking at.