The question:

For any origin and a destination, such that there are SDR (anytime day return) and 7DS (7 day standard season) prices defined (with exactly the same route*), what are the highest and lowest achievable

**ratios**of 7DS price to SDR price?

Here's a starter:

SOU Southampton Central to WAT London Waterloo

SDR (any permitted) £92

7DS (any permitted) £155 = SDR price times

**1.685**

ECR East Croydon to RDG Reading

SDR (not via London) £21.10

7DS (not via London) £110.70 = SDR price times

**5.246**

Can we get lower / higher?

* Undoubtedly there are cases where 7ds and sdr on different routes actually have the same validity, or suchlike, but let's keep it simple