Surname on certificate/passport

[MWill]

My wife has ILR and will soon be eligible for naturalisation. She has a surname with a second capital letter in it - like McDonald or LeBlanc - but on her US passport a space is added - i.e., MC DONALD or LE BLANC. This seems to be a standard thing on US passports with names like that. It's also formatted like that on her Biometric Residence Permit.

Just wondering what best to do with her naturalisation and UK passport applications. The naturalisation form asks for the name in block capitals and to explain if it's spelt differently to on the passport. She'd normally write it without the space - should she do this and then explain why it's formatted differently? It's the same name - it's not like she'd changed it. Or is it best to just go with the spaced version?

Just not sure whether, if it then appears without the space on her naturalisation certificate, this would cause a problem with her UK passport application, as she'd be providing a naturalisation certificate without the space and a US passport with the space.

I'm sure it's something they encounter all the time with Americans with name like these and it seems like a minor thing to us, but just wondering if anyone knew!

[MWill]

Sorry for bumping, but does this look OK? Want to avoid something silly happening like them treating it as a name change, when it's just a formatting thing. They must have seen it before, surely?