I expect one of the keys in the set you got will be the right size. My S40 is like your old Rover (like all Rovers) just need a hex spanner.
The only thing about Halfords oil is it is a rip off, like all the other bits in there. However sometimes nowhere else is open, and it is convenient... which is how come they charge more money I guess. It is possible to get 5L 10w/40 semi-synth for as little as £6 or £7. And that's the sort of oil I'd put in your motor.
Pete
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