Why do law degrees rarely offer a year in industry?Watch
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Also the training contract/pupillage is the year industry of a sorts I suppose, since you won't be a fully qualified lawyer or barrister until after completing that. Additionally there are (or maybe were) restrictions on how long you could take to complete a law degree after beginning one and have it count as a qualifying law degree (QLD), which was I think seven years. So adding an extra year in the mix could make things a little narrower to complete within that timeframe if there are serious (non-academic, extenuating) issues that arise which delay things.
firms struggle to find work to give to a vac schemer, let alone a year long placement person!
most firms have plenty of applicants and don't need to use the placement year as a recruitment thing
there's a formal training period (the PRT/pupillage) for successful applicants. you're not expected to arrive having all the skills and expertise to hit the ground running.
2. too many applicants/interested ppl for too few places
3. law firms prefer to train permanent paralegals and secretaries instead of temps for rote work, especially when the pay is similar. they stick around
p.s. i remember seeing something between exeter and reed smith. not sure how many places are available but it does exist.