Can anyone identify this tree in dd’s garden?

It looks like Spirea to me, what a lovely plant.

Witzend this is the closest pic we can find, seeing as we don't have any other details such as deciduous/evergreen, and I think someone else has suggested it:
www.rhs.org.uk/plants/89242/Crataegus-persimilis-Prunifolia/Details

Let's hope I live up to my name!

Shrub, what a great name! I think you are right. Cratageus prunifolia looks identical to the new photo supplied by the OP.

I can't see why it isn't a dotted hawthorn. It grows well here, and there are suppliers in England, according to the RHS.
Since the previous owner was a keen gardener it is more than possible.

How about Cretaegus prunifolia?

Is it evergreen Witzend? I should've asked that in the first place!

Virburnum tinus is evergreen. Spirea vanhouttei is deciduous.

I think it's a viburnum tinus. I have one.

Picture might help!

Might it be this? Spiraea Vanhouttei
www.google.co.uk/search?q=spiraea+vanhouttei&source=lnms&tbm=isch&sa=X&ved=2ahUKEwj43Kf398TpAhXeQEEAHZaCCIUQ_AUoAXoECBMQAw&biw=1250&bih=621#imgrc=la4BoWZQdYWG2M

Thanks everybody. The leaves are not deeply serrated like that pic of sorbus, Northernlass , they are very finely serrated. Don’t know about the backs of leaves - shall have to ask dd to send a shot.

We're almost 100% sure it's in the Roseace:

www.britannica.com/topic/list-of-plants-in-the-family-Rosaceae-2001612

I'm unable to find reference to Cratageus punctata in Britain so it may be confined to N. America/Canada

It may be a Sorbus eg Sorbus intermedia (not Sorbus aucuparia - Mountain Ash). Are the backs of the leaves downy?

www.vdberk.co.uk/trees/sorbus-intermedia-brouwers/
It may not be this variety but I've sent the pic as a guide.

Or it may be a Cratageus, which includes Hawthorn. What's the bark like? Is it thorny or not?

DH (a botanist) and I (plant lover and gardener of 40+years) are pretty sure it's not a Viburnum, Hydrangea, Rhodedendron or Prunus virginiana.

Sorry shysal, we don't think it's Virburnum lantana. If you compare each individual flower to the OPs photo, you can see that hers show them to have rounded petals. V. lantana's individual flowers are very different.

Some people get a scent of Lillies but others can’t stand the smell?

Thank you all. Minimoon, that certainly looks like a possibility. It’s not a rhododendron or a climbing hydrangea (I’ve got one of those) - it’s def. a small tree rather than a shrub or shrubby-type of tree.

Great to see the answer. Thanks from me too.

It looks like a Wayfairing tree. Species of Viburnum

Viburnum especially if the flowers are very fragrant.

It’s definitely a vibe rum. There are loads of different varieties,I can’t remember which one.

Witzend PlantSnap suggests Prunus Virginiana en.m.wikipedia.org/wiki/Prunus_virginiana#/media/File%3APrunus_virginiana_flowers.jpg

I have to say my first thought looking at the leaves was that it was some sort of Prunus.

Azalea family ?

I suggest you post on Gardener’s World website. They are wonderfully knowledgeable.
I would have hazarded a guess at a hydrangea as the leaves are similar.

It looks like my climbing Hydrangea but mine won’t flower for another few weeks yet.

I was admiring some similar trees on my walk this morning, but sorry, I don't know what they are. I shall be interested in the answer.

Posted too soon. This might help with your identification.