Are you referring to the old BS546 plugs? (These are the 5 and 15A round-pin types which predate the 13A fused plug, and in fact were still in fairly widespread use well into the 1960s).
If so, then the arrangement is not reversed if they are wired correctly.
For all BS546 5A/15A and BS1363 (13A) connectors, if you look at the face of the socket with the earth connection at the top, then line is at the lower right and neutral to the left.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local