I would say so. You have two noises going on. The fast ticking will be the injectors but the slower tap is most likely a valve.
However, You say its been stood? Have you since changed the oil? Because when my oil get near the point of change it gets a lifter tap for the first 3-4 mins then quietens down. Have you run it for long to see if it goes?

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See the sheer power and might of the lesser known burrowing owl.

Maybe try some whynns lifter cleaner. Might just be a sticky lifter. A bent valve and dodgey lifter sound the same in my experiance and iv had both. Hope it aint too much matey.

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See the sheer power and might of the lesser known burrowing owl.

it is said that if your valve clearances are adjusted properly you can experience a very slight loss of power but not always, if you're going to adjust the clearances make sure you have the write gap for the inlet and outlet valves if there not enough gap it if possible that the valve could burn out, just get a good feeler gauge and a Haynes manual or auto-data

It's always hard to hear if it's a tapper from a video...
Have you driven it hard yet? That should normally shake the lifters a bit and make them not tap anymore. If it still taps, throw in the cleaner like aaron6 says and follow the instructions. After the cleaner, refresh the oil.

If it still taps after this you could try to take the lifters out and clean them (taking them apart), but you might as well take the head of and check everything else while ur at it...