If the call to the 0871 number cost only 8p, then it is fortunate that no 1-minute minimum rule applied to the Access Charge.
CJT-80 wrote on Jan 8
th, 2021 at 5:36pm:
From the OP's point of view it would depend if it's a pre or post sale enquiry.
In terms of the law, a post sales call to the 0871 number would be illegal (i.e. deserving of a refund).
In practical terms, it is likely that calls to both versions of the number are routed in the same way. It is unlikely (and would be commercial nonsense) for a pre-sales enquiry or order to be refused if the 0371 number was dialled.