"Tipos de dietas
Normalmente las dietas se dividen en 4 tipos:

Dieta: que compensa los gastos de comida, cena y alojamiento y desayuno. En algunas ocasiones y dependiendo del Convenio Colectivo, los gastos de alojamiento no están incluidos.

Media dieta: compensa los gastos cuando se tiene que hacer o bien la comida o bien la cena fuera del centro habitual de trabajo. Aunque se llame media dieta no siempre la cuantía es la mitad de la dieta completa

Gastos de estancia/alojamiento:...

Gastos de transporte..."
https://loentiendo.com/dietas-desplazamiento-trabajadores/#T...

So, I reckon that 'Dieta entera' is what is described above as 'dieta' where accommodation is included with all meals.

"How does the HMRC subsistence allowance work?
HMRC updates the exact amounts that can be claimed as part of subsistence allowance every year, so make sure to check the official HMRC website to ensure that you have the latest up-to-date information. As of April 7th, 2019 the official HMRC meal allowance rates for UK business travel are:

£5 for travel of 5 hours or more
£10 for travel of 10 hours or more
£25 for travel of 15 hours or more, or if the travel is ongoing after 8pm...

...Overnight accommodation rate UK
The UK government has no agreed benchmark for overnight accommodation expenses, unlike its international rates below. If this is a recurring cost for your business you will need to establish an agreed rate with HMRC. "
https://www.travelperk.com/guides/business-travel-expenses/s...

"2. SUBSISTENCE (For absence from home of 8 hours or more)

Meal allowance (for meals not provided) breakfast £7.60 lunch £10.70 dinner £30
These allowances are in line with NEU Treasurer Handbook rules.

(Equality Conferences are usually booked/paid on full subsistence allowance so no expenses are payable to delegates except travel costs as above)"
https://neu.org.uk/media/10476/view