Design Around Linking 2 Shared Worksheets

The spreadsheet I have designed is to be input offshore by one group, and the values that get put in this shared workbook will feed into another shared workbook (for reference and ease, I will call one offshore. book and the other uk.book).

It seems that I have to save the offshore.book (so could I use some autosave code, for every 5mins or so? I dont have the plugin so would have to write it in), then hit update links in the uk.book (again, I presume I could write this so it triggers off every 30mins or so, but can be done manually if required). It seems abit fiddly doing this, but this is the way they wanted it done (my idea was to put into a database, but got out voted).

The figures in the uk.book would simply be a vlookup. However, we do not want the uk team to be able to look at the other book so would the links still work properly? (ie there would only be one open workbook at a time - direct access to each others spreadsheets shouldnt occur.)