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I am analysing BHPS and UKHLS data and am using the ONS output area classifications as a variable in my analyses.
I've downloaded the csv file with output area classification codes and names from the ONS website here:
https://www.ons.gov.uk/methodology/geography/geographicalproducts/areaclassifications/2011areaclassifications/datasets
but don't seem to find names for the codes 5c3,5c2,5b4,6c2,4b4,and 4d2 found in the combined BHPS and UKHLS dataset. I am wondering whether these codes were included in the BHPS and UKHLS datasets in error?

From the .csv file that I downloaded from the ONS (2011 OAC Clusters and Names) I have the following codes and names (tallied to get n for each code):

1a1  1a2  1a3  1a4  1b1  1b2  1b3  1c1  1c2  1c3  2a1  2a2  2a3  2b1  2b2  2c1  2c2  2c3  2d1  2d2 
2454 3086 3043 1581 5272 4811 3600 1030 1183 1240  467  574 1520 1449 1221 1683 1182 1402 1002 1239 
 2d3  3a1  3a2  3b1  3b2  3b3  3c1  3c2  3d1  3d2  3d3  4a1  4a2  4a3  4b1  4b2  4c1  4c2  4c3  5a1 
1386 1958 1551 1382  660  921 1043  543 1278 1094 1419 4488 3512 2942 3540 2606 2322 1803 2289 8046 
 5a2  5a3  5b1  5b2  5b3  6a1  6a2  6a3  6a4  6b1  6b2  6b3  6b4  7a1  7a2  7a3  7b1  7b2  7b3  7c1 
6378 6700 4961 4130 8482 3409 4353 7174 4865 3434 9860 8178 5577 2170 3214 4005 1344 1428 1980 3382 
 7c2  7c3  7d1  7d2  7d3  7d4  8a1  8a2  8b1  8b2  8c1  8c2  8c3  8d1  8d2  8d3 
3225 2901 1526  909  739  312 6448 5026 4289 4845 5527 3209 4053 3527 4435 2479

I've also checked the Pen Portraits for the 2011 Area Classification for Output Areas (Updated in April 2015) but don't find the codes there either.
Does anyone know the corresponding names for the codes 5c3,5c2,5b4,6c2,4b4,and 4d2?
with many thanks