I also mentioned 542.3.1, and that says that, when there is PME, Earthing conductors also have to satisfy the requirements for bonding conductors with PME (i.e. comply with Table 54.8)! ...
542.3 Earthing conductors
542.3.1 Every earthing conductor shall comply with Section 543 and, where PME conditions apply, shall
meet the requirements of Regulation 544.1.1 for the cross-sectional area of a main protective bonding conductor. ...
That may be true for the OP but, in the more general case, 60A would not necessarily be 'more than ample', unless one were perhaps prepared to accept very slow EV charging - it all depends upon the 'other loads'.
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