Front of house hedging ideas - terrace

We’re looking to plant some hedging at the front of our house - a terrace Victorian house in a city centre. The area to be hedges is about 4m length. Purpose of the hedge is to provide a bit of boundary and smarten up the look of the house. It’ll also have the added bonus of helping shield from pollution from passing cars. We’d plan to keep the hedge 4ft high and don’t mind waiting a couple of years to get to this height (and so save money by buying younger plants). Definitely evergreen.

I love the look of deep green hedges - the colour of box/ ilex crenata. However I think these are out of the question as they will take a long time to achieve the desired height.

I also love the look of red robin hedges when they are dense. But I also seem to see a lot that are a more straggly looking which I’m not so keen on. But we’re happy to invest the time into trimming it to help it get dense. 

I wondered on what thoughts were on planting a red robin and cherry laurel mix? I noticed that their leaves are similar shape so it could work quite nicely? And the laurel might help thicken out the hedge? Perhaps 1.5ft plants, planted 1ft apart to achieve a dense hedge?

Or any ideas for what could be mixed with red robin (eg one red robin hedge, one deep green hedge, one flowering hedge?) all planted in a row?

Or alternatively any other ideas of hedging? I’m not sure on privet. Yew was another option as it is dense but could be quite dark?

Thanks. Would love some suggestions. I wonder around seeing beautiful hedges but not sure how they are achieved/ what the plant is!

Thanks