I've searched high and low in the manual in an attempt to discover how one activates the heating elements in the wing mirrors but to no avail. Only by reading through other posts in this section on the subject of folding wing mirrors did I discover that the heating function is activated by pressing the rear window defrost button although not having suffered any frost yet I've been unable to validate this.
Can someone kindly reassure me that I'm not going senile and that in fact there is no mention of this in the UK manual version (have also checked the German version by the way), but if it is mentioned, please indicate the page. Thanks.