New springs and shock absorbers will bring the ride height back to standard.
Increased ride height springs will only increase the ride height by about 15mm.
The problem with increased ride height springs and shock absorbers is the difficulty finding ones that are a good match to the original Skoda parts that the increased ride height cars use, as the aftermarket is generally aimed as standard ride height cars.
Try the standard ride height with new springs and shock absorbers, and if you're still not happy with the ride height fit slightly oversize tyres with a slightly bigger outside diameter, but I doubt you would need to do that even for London roads. Most people who fit increased ride height springs and shock absorbers take their cars off-road such as down rutted dirt tracks...and that's where the Octavia Scout comes in, as that car uses both 15mm increased ride height springs and approximately 15mm increased ride height from the tyres...making a total increase in ride height of about 30mm.
Front springs for Octavia MK3 1.4 petrol 150HP hatchback DSG standard ride height 5Q0411105GH
Kilen 23129
https://www.ebay.co.uk/itm/354459092355?
Rear springs for Octavia MK3 1.4 petrol 150HP hatchback DSG standard ride height without towbar 5Q0511121AE
Kilen 63139
https://www.ebay.co.uk/itm/354459092356
Good matching aftermarket springs were easy to find. Not so easy, is finding good matching aftermarket shock absorbers...at least without the OEM part numbers for the original shock absorbers that the car left the factory with.
So what are the OEM part numbers for your front and rear shock absorbers?
You can find these out if you have all your car's build codes.
There's an ebay seller who can supply your car's build codes for about 3 Euros.
Search "skoda vin decoder" on ebay to find the listing
https://www.ebay.co.uk/itm/224631127243
As you can see below, some of your car's build codes may include L03 1JA 0YE.
If your car is still on the original front springs, they should be marked with coloured dots that are used to identify them. 1 Blue dot and 1 Violet dot means that the front springs have OEM part number 5Q0411105GH, as shown below.
It looks like the rear springs aren't marked with coloured dots.
Front coil spring 5Q0411105GH L03
1 Blue dot, 1 Violet dot
Rear coil spring 15Q0511121AE 1JA+0YE