The GDL is highly unlikely to run out of places. They typically only fill around 50-70% of their places each year and are likely to still be selling the courses in the weeks leading up to the programme starting.
I would speak to the firm you are doing a vacation scheme with to see what their process is for GDL courses. Some firms no longer put trainees through the GDL. Others do, and may have a preferred supplier, but may just reimburse you what they would have paid their supplier if you are committed to a course. Worthwhile speaking to them to get advice on how they would navigate the situation.
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