Can dual nationals 'mix and match' the passports they use when travelling?

[StrongerOrWeaker]

For example, say you have both Italian and British passports and you travel from Britain to Italy, can you cross the border one way using one passport but use the other passport the other way? How about the two border control points you cross in one direction (leaving Britain then entering Italy)? Do these have to be crossed with the same passport?

canada and us you cannot enter on a foreign passport if you are a citizen.

You can, because I have. But they do give you shit about it and make you present the passport/proof at a later date.

Thanks everyone. One final question- how does it work with travel insurances? Do they not normally ask you what nationality you are? Do they let you give both? If not, can it create a problem further down the line if you have one nationality but were travelling on another?

I buy travel insurance for the country I'm travelling to with both nationalities on the form.

I will say though that the NHS finds things difficult to process. When living abroad I used the NHS on holiday and tried to pay. They refused because it was more difficult to make me pay than just wave me out!

Thank you. I didn't realise you could give both nationalities.