API limit increase

Our Supplier Relation Management platform, currently uses the Companies House API for collecting extra information for our customers’ suppliers.
Currently we have been doing this in the background, so we have managed to work around the limit of 600 calls per 5 minutes.
However we are now building a companies house lookup functionality into the platform that would allow our customers to lookup for their companies using a search box with autocomplete.
This will be loaded in realtime and displayed to the end user, we worry this will cause us to hit our limit as the user is attempting to use this new feature.
I would like to know what are our options regarding expanding our limits and or any other suggestions on how we could handle this situation?

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I have DM’d you regarding this.