There have been no area codes in England, or the rest of the United Kingdom, that begin with '04' since the year 2000.
If the number you have dates from before the major national renumbering in year 1995, it would be the code for Guildford. That code has since changed to 01483.
The area code for Fort Portal, Uganda, is 0483, or +256 483 in international format.
01420 is for Alton, in Hampshire.
Chipping Norton, Oxfordshire.
The area code of 01702 is for the seaside resort of Southend-on-Sea.
No-where - UK numbers starting with 07 are mobile (cell) phone numbers.
0121 serves the Birmingham, England area for telephone networks.
(01933) or +44 1933.
01254 is the code for Blackburn in Lancashire. 82 is part of the local number.
01274 +44 1274 from overseas.
Ruhinda is not a place name in present-day Uganda, so it does not have a telephone area code.
Nowhere - UK numbers starting with 070 are personal "follow-me" numbers, which can be forwarded to almost anywhere in the world.
It is (01603) or +44 1603.