They've finally announced which tests are acceptable:

https://www.gov.uk/guidance/coronavi...d-type-of-test


Your best and cheapest bet is antigen because thats only 57.50 CHF vs 195 CHF (if you want the 5 hour PCR test at the airport) and you can get it at some pharmacies with appointments and results in 15-20 mins. Obviously you can also get an appointment for a PCR cheaper outside the airport but they're still around the 120-140CHF mark with 24-48 hour results.

As someone who commutes to the UK regularly I'm extremely happy they're accepting antigen tests.