Second one is Persicaria possibly Red Dragon. It does well in light shade like that.
Would like en even close view of the leaves and flower of the first shrub.

Could the red one be Atriplex?

I agree with Owd that a closer view of the shrub would be helpful but it might be an elder of some kind.

Is the shrub a Cotoneaster, maybe?

Hello,

I've updated the first photo to include a better close-up of the leaves. Hopefully that'll help.

For the second, I've had a look at Persicarias, and they look possible, though the leaves on this specimen seem wider, less variegated, and less crinkly edged than others on the net...

Piers.

I thought the first one was a red leaved variety of Lysimachia ciliata, perhaps Firecracker??

On second thoughts, purpurea not firecracker? If that's what it is it will have little yellow flowers up the stem in summer and its inclined to spread if not controlled.

Changed my mind about the red leafed thing, agree with Stereagram, Lysimachia Firecracker. An awful thug which I have been trying to eradicate for over 5 years.
The shrub could be Choiysia, but not sure.

Hello,

The Lysimachia Purpurea looks quite likely to me. As far as I'm aware it was planted some years back but doesn't seem to have spread at all, maybe that's due to the shady spot it's been in.

The first plant is definitely not a Choisya (unless it's an unusual variety), I have one of those in my own garden and know it well. Various things don't match, for example the leaves are arranged alternately, not whorled.

Piers.

I'd go with Persicaria for the red leaved plant, those markings are typical.

The flowers will clarify it with a little patience.

Hello,

According to the guy who planted them, the top plant is a Spirea japonica, which surpised me. Looking online, might it be a nipponica, not a japonica? The leaves look more similar.

The second is apparently a Persicaria, but I've no info about the variety.

Piers.