Yes, and if horizon Europe was solely about gaining funding then it would be a dud deal but there are a lot of other advantages brought by the program that benefit the UK, either through indirect financial returns, like access to markets, and non financial returns like steering development to address issues more pertinent to UK environment.
If everything was just about money then it would be really easy calculate the ROI upfront and then decided to opt out.
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u/ConsciousStop 2d ago edited 2d ago
The UK is on that list because it's an associate member of Horizon Europe and contributes €2.4 billion annually into it.
Source: https://ec.europa.eu/commission/presscorner/detail/en/ip_23_6327