Unfortunately you need 3 MREs to be equivalent to 1 French RCIR or British 24hr MCRs. MREs are available in the UK but the cost is ridiculously expensive (around $20 each). Typically the cost of 1 MRE is the same as 1 French RCIR or British MCR. The FSR for some reason appears to be similarly priced to US sources. i.e. around $30 a piece.

I have around another 12 RCIRs which is equivalent to around 36 MREs i.e. 3 cases of MREs. They are very tasty with at least another 3 years Best Before Date. I may actually purchase some more considering the quality of the rations (they can actually be considered good enough for everyday consumption) and what is currently going on in the world.