The Authors investigate a novel application of generalised concatenated coding theory to the E.S.A. Coding standard. The proposed coding and decoding system is compared to the E.S.A. coding standard, with both systems having the same coding rate. A number of RS codes are used in the system, each capable of correcting a different number of errors. The performance of the system is compared with and without feedback between the decoding modules. The system with feedback is shown to out perform the E.S.A. standard telemetry coding scheme. Different system configurations have been simulated and compared to find an optimum solution.