Can anyone advise what version of “sync” is likely to be installed on 2016 Mk5 Mondeo? Are there any software updates available and how can they be installed

If it's early 2016 it'll be Sync 2. Sync 2 has a home screen with a dark background that's split into 4 for phone, navigation, climate and audio. If it's a later 2016 and you're lucky, it'll be Sync 3. Sync 3 is usually a lighter background (unless it's in night mode), with a row of buttons at the bottom for accessing audio, navigation, etc. Not sure about Sync 2, but updates for Sync 3 are available from the Ford site:

https://www.ford.co.uk/owner/resources-and-support/sync-bluetooth/update#/

You'll need a USB for the update process, preferably at least 32GB for both Sync and maps updates. Once downloaded onto the USB, installation is basically as simple as plugging it into the USB port and waiting for it to finish. Just bear in mind it can take up to an hour, so you may want to plan on going for a drive whilst letting it update. Full instructions here:

https://www.ford.co.uk/owner/resources-and-support/ask-ford/technology/sync-updates/usb-update-instructions-for-sync-3

Yes, as Eric says, if its early 2016 it will be sync 2.

If it is sync 3 it will be as Eric describes.

If it is sync 2 it is very easy. The maps are on an SD card in the centre console/armrest. To remove the card you need to press it in first, feel it click, then release and it pops out.

You can pay megabucks for a new card off Ford or get one of these - loads of suppliers, here is an example

https://www.ebay.co.uk/itm/NEW-FORD-F8-SYNC2-NAVIGATION-SD-CARD-SAT-NAV-MAP-UK-EUROPE-2019-2020/124252232278?hash=item1cee029a56:g:L-0AAOSwV~1fBav8

If you have sync 2 drop the card out to see if you have latest maps or not. Replacement is just plug and play