The question conflates two separate regulatory regimes. One member interpreted "BC" as a British Citizenship application; the other as a business or compliance check. These are fundamentally different contexts.

On ISA oversubscription itself, both members agree on the core fact: oversubscribing an ISA does not automatically trigger rejection of associated applications [1]. HMRC treats ISA oversubscriptions as administrative errors requiring correction—typically removal of excess funds and tax on interest earned on the overage. The ISA becomes invalid for that tax year until repaired, but repair is a standard process, not a grounds for application rejection.

If "BC" means a British Citizenship application, one member notes that honest financial mistakes are generally not treated as evidence of bad character unless deliberate fraud is involved. If "BC" means a compliance or business check in a financial context, oversubscription alone would not cause automatic rejection—the provider or regulator would contact the account holder to correct the error.

Without clarification of what "BC" denotes, a definitive answer is not possible. The underlying ISA rule, however, is clear: oversubscription triggers administrative correction, not application rejection.