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Pretty sure this is the bike-only fare, you still need to buy a ticket for yourself! You may well have known that, but £20 e/w to transport my bike never seemed great value. But yeah, I've used it a few times, they don't guarantee which train your bike will be on so to avoid any waiting/missed connections I've always dropped it off the day before I travel and it's always been there waiting patiently for me when I arrived...
owl-
No, this includes travel - it's a bloke in a minibus with a trailer, and the bikes go in the back. You can find discussion of various people's experiences on the CTC forums IIRC. The major downside is that it involves pick-ups and drop-offs in desolate industrial estate car parks a fair way away from train stations at (by my reckoning) slightly inconvenient times, but by all accounts if everyone in a group is going the same way the drivers will sometimes drop you off somewhere more convenient.
Thrustvector
Has anyone used this service? Cost says from £20, seems too good to be true...
https://www.eurotunnel.com/uk/traveller-info/vehicles/bicycles/