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To find the one that is click here (This is regards the oil)
They label each bottle for different things even if it is the same grade. The Mobil 10w40 will be perfectly fine.
Sump washer should be readily available from VX for less than a tenner with the filter included.
VX used to be the cheapest place to buy service parts. Don't presume your local factors are the cheapest place, or that the dealership parts are always the most expensive.
And it might be possible that this is still the case, especially for the Desmond. You should be able to do an oil change for sub £40 using genuine* parts, plugs air and pollen filter should be lnotably ess than £100.
* Genuine being actual VX branded parts rather than some unknown 'OE' brand that will change according to the last sales rep that came in. They are rarely the same thing and usually cost more than going to the dealer.
https://www.ebay.co.uk/itm/404456052246 for example...