"The fear is we will be increasingly isolated from our EU partners (sic)"
or a variation on this theme.
Readers, please note: When they say 'we', they don't mean us, they mean them.
The isolation they fear is their own isolation from the Brussels bubble, from the euro-trough. No more soirées, no more canapés, no more junket conferences, no more late-night boozing sessions on the tax-payer tab.