Thank you for the replies, much appreciated.
I have also found this on the SSPX site which further discusses conditional baptism and confirmation.
Why does the Society of St. Pius X administer conditionally the sacraments of baptism and confirmation to those who received them in the Novus Ordo?
It is forbidden for a priest to administer a sacrament conditionally unless there is some doubt about the validity of the sacrament already received. A mere suspicion does not suffice, but any real doubt does (i.e., when there is a positive reason to think that the sacrament might have been invalidly administered), since the sacraments are so necessary for the salvation and sanctification of our souls.
In general there is no doubt as to the validity of the sacrament of baptism administered in the post-Conciliar Church, since the matter and the form are very simple and have been retained, despite the whole new theology replacing the washing of original sin (and actual sin in adults) from the soul with the nebulous social concept of belonging to a community. In general, there is no reason to doubt that the priest has the intention of doing what the Church does, even though he may have a false notion of what this is. However, it will happen from time to time, that the sacrament is administered in such a sacrilegious way as to place in doubt even the matter or form or even the intention of doing what the Church does. In such rare cases, in which even the rules of the Novus Ordo are not followed, it may be necessary to administer the sacrament of baptism conditionally in order to guarantee validity.
The bishops of the Society administer the sacrament of confirmation conditionally when the faithful request it, that is, when they have a reasonable doubt as to the validity of the sacrament that they received, and this doubt cannot be resolved, as is usually the case. This is the case if oil other than the sacred chrism is used, or an oil other than olive oil (highly doubtful, since at variance with the divine institution of using olive oil) as is now permitted in the new rites, or if the signing with the sacred chrism and the imposition of the hand were not done at the same time, or if there is a doubt about the words used. Since there is a great variety in the words used, and since the traditional words "I sign thee with the sign of the cross and I confirm thee with the chrism of salvation, in the name of the Father and of the Son and of the Holy Ghost"are never used, there is very frequently a doubt about the validity of the administration of this sacrament. This is the reason why the Society’s bishops do not hesitate to administer it conditionally when asked to do so. [Answered by Fr. Peter R. Scott]