What should I replace a tree with?

Hello lovely people. First time gardener and GW poster.
Last year our local water company had to dig up part of our front garden to remove and replace a damaged sewer (the chamber is in our garden).
They had to remove a lovely tree and bush and have promised to replace with whatever we want as long as it's not a tree (although the tree didn't cause the damage, it was just an olf Victorian sewer) or anything that will have deep roots.
I love Hydrangeas and I was also thinking of getting California Lilac (would love to get bee and butterfly attracting plants). I'm not sure if this would be the best for the area. Does anyone have any other better suggestions?
I have attached a couple of photos of where the plants will be going. I was thinking the Lilac at the top and the Hydrangeas on the bottom. The middle I will leave for bulbs or any other smaller plants.
We are in SE London so the soil is typically clay although I think the builders filled in the hole they made with a mix of top soil and other dirt. I would get some soil improver too. That part of the garden usually has a lot of sun.
Thank you so much!
PS - Please excuse the weeds. We are letting the garden go wild. Also, we have no idea what we're doing but learning


Last year our local water company had to dig up part of our front garden to remove and replace a damaged sewer (the chamber is in our garden).
They had to remove a lovely tree and bush and have promised to replace with whatever we want as long as it's not a tree (although the tree didn't cause the damage, it was just an olf Victorian sewer) or anything that will have deep roots.
I love Hydrangeas and I was also thinking of getting California Lilac (would love to get bee and butterfly attracting plants). I'm not sure if this would be the best for the area. Does anyone have any other better suggestions?
I have attached a couple of photos of where the plants will be going. I was thinking the Lilac at the top and the Hydrangeas on the bottom. The middle I will leave for bulbs or any other smaller plants.
We are in SE London so the soil is typically clay although I think the builders filled in the hole they made with a mix of top soil and other dirt. I would get some soil improver too. That part of the garden usually has a lot of sun.
Thank you so much!
PS - Please excuse the weeds. We are letting the garden go wild. Also, we have no idea what we're doing but learning



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Nice size to give some screening from houses opposite, but still easy to prune.
Fabulous Autumn colour.
Berries for the birds.
It's a good'un
https://www.rhs.org.uk/plants/26602/Amelanchier-lamarckii/Details
"A. lamarckii is a large erect deciduous shrub or small tree of open habit, with bronze-tinged young leaves turning orange and red in autumn. White flowers in short lax racemes as the leaves unfurl. Fruit a red to dark purple-black berry, soon eaten by birds"
I was looking at Rosa rugosa 'Rubra' (red Japanese rose) as it looks lovely but the information on the site says roses can be 'quite deep-rooted' plants. I'm not sure if this would be ok to be near a sewer system in our garden. The actual sewer is about 9 feet down though. The water company haven't been very helpful with suggestions - just "no trees".
Would also love Hydrangeas but their root system seems to be quite big from what I understand.
So I guess what I'm asking is, does anyone have any suggestions for plants, shrubs that can grow close to a sewer system?