They are as much as tax reasons dictate it

If you have a closer look, the web tells you that "only" the registered office is in the UK, whereas all the other functions...

ADR depositary
JPMorgan Chase & Co
PO Box 64504
St. Paul, MN 55164-0504
USA
Telephone +1 800 990 1135
(US callers – toll free)
+1 651 453 2128
(non-US callers)
Email:
[email protected]
www.adr.com

Stockbrokers
Bank of America Merrill Lynch
Goldman Sachs
Auditors
Ernst & Young LLP

Investment bankers
Bank of America Merrill Lynch
Citi
Goldman Sachs
Solicitors
Freshfields Bruckhaus
Deringer LLP

Anyhow.. it doesn't make that much difference in just having a rly bad advert here with a pic that shows a beautiful place but is away 650 mls from the nearest place to stay they could offer..