The other thing to stress is that CV-blind interviews do not mean CV-blind recruitment processes. These are two different strategies.
A CV-blind recruitment process means you won't be assessed on what you have done, only how you perform against certain criteria. These application processes typically do not require you to disclose your academics or work experience but rely on how you write application answers. It is rarely seen in law but is particularly seen more so in the public sector roles.
A CV-blind interview is just your interviewers not knowing anything about you. Up until that point you are likely to be be assessed on what you have achieved to date alongside your application answers (e.g. the recruiter has effectively screened your CV/application) but at the point you are interviewed, your interviewers will not have any prior information about who you are/what you have achieved. However, the conversation (even the "where did you travel from today" before your interview has even started) is likely to highlight certain information and then judgements are made on where you have studied etc anyway.
In terms of bad grades, it also depends what grades you are talking about. If A-levels or equivalent, then just look for the firms that do not have a minimum A-level criteria. If it is more about your degree grades, then this is trickier - most firms are looking for a good 2.1 because your chance of passing the LPC (or now the SQE) is much higher. For instance, in the last round of SQE1 results people with a first were twice as likely to pass the SQE than someone with a 2.2. There are a few firms/organisations that do take on people with a 2.2, although they tend to be organisations that do not sponsor work permits (making it much more difficult for international students in this category).
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