(I'm not Companies House) - the only info on this I've seen is as per my reply to this post:
I believe you can add some address requirements on searches for companies and officers e.g.:
Of particular note is the "what is search for" information which explains the rationale / use that they're targetting:
Why would you need to search by postcode AND country? The reason I ask is I suspect this is not going to be entirely relevant because:
- Of course It's possible for "postcodes" to be the same in different countries (e.g. France / US ZIP) but you could easily check the results afterwards...
- ...That is, if the country is set in the Companies House data. Which it may well not be, or the format may not match (remember - for a data set across enough time even countries are not static...). In fact you won't necessarily find a postcode (it also may not necessarily be in the "postcode" field).
- In fact, since the data is user-input, you'll find all sorts of stuff in there. So much so that I strongly suspect (I don't know of course) that Companies House search will not be either complete or accurate.
Obviously it depends on what you need from this!