Not sure its the issue of modern stuff - i think it is generally MGR rubber hoses - see link below to Rimmers for a replacement. Also by the look of the photo the hose clip where it is leaking is a jubillee clip - many on here would advise not to use jubilees on MGR rubber hose but stick to the OEM MGR spring clip which the clip at the top of your photo appears to be.
https://rimmerbros.com/Item--i-GRID001598
As to refilling no doubt a V6 expert will come along and advise. 
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She came off the Longbridge Line on 20-05-2003
The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
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