What options does a person of Church of England religion have if they are not sure if they were baptized in infancy, and can't prove it either way?

If a Church of England member has never been baptized, then there are pathways to receive this sacrament . You can only be baptized once . What happens if a Church of England member is *unsure* and *cannot prove either way* whether they were baptized in infancy? Can they be baptized now? The usual sources of proof - certificate, parish registers - are unavailable or destroyed, and there is no-one living who would be able to recall the original baptism.