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I don't think I have seen a shower which has not stipulated RCD protection, normally 30 mA so seems likely the instructions say 30 mA RCD not 30 amp MCB, as already said likely needs a 40 amp MCB. The Memera 2000 consumer unit is now rather old, and to find the parts required is going to be a problem. As said a consumer unit is a type tested distribution unit and the type testing means only items tested can be used, so has to be made by Eaton that they say fit that CU.
This means in real terms you need a new CU, which is not a DIY job.
This means in real terms you need a new CU, which is not a DIY job.