Here, on the view which we have taken of the construction and application of the third party policy, there was such a double insurance. We consider, therefore, that the appellant was entitled to contribution from the respondent. As we have said, however, the appellant has, by the amendment to its original claim, sought that the contribution, so called, should be an indemnity. This claim is that, although there was but one insurance, the loss should be borne by one of the insurers to the exclusion of the other. In considering this, one suggestion may be disposed of shortly. The Law Reform (Miscellaneous Provisions) Act, 1946, s. 5, cannot itself be a source of any right of one insurer to recover from another. The operation of that provision is confined to tortfeasors. Furthermore, there is no contractual relationship between the two insurers. Accordingly, any claim that the appellant has against the respondent must depend upon the right to contribution arising from the double insurance of the one risk, i.e. the risk of the employer's liability in damages for the negligence of his servant for which he must bear the responsibility. Such a claim is, by its very nature, one to rateable relief and it is not immediately obvious how, when there is a double insurance, one of the insurers should be able, in proceedings for rateable relief, to throw the whole burden of the indemnity upon the other. Indeed, the purpose of the doctrine is to avoid this very thing. The doctrine is not concerned with working out the rights of insurers and third parties. It is concerned with distributing the indemnity to which the insured is entitled under policies of insurance with two insurers. If the rights of insurers and third parties are involved, a further element is introduced, namely, what is, or could be, the result of the exercise by an insurer of his right of subrogation to the position of the person who has been indemnified.