Newbie gardeners. Just moved into a house where the small front lawn (20 -
25 sq m) is about 15 or 20 percent dandelions. Can anyone here either
advise
us what to do,

I got one of those ready made lawn weedkillers and sprayed mine. It took 2/3
apps but eventually worked. (I did this because I did not have the time to
dig them all out and wanted to keep most of the "weeds" as I really like
daisies and many other wild flowers, just wanted to get rid of the
dandelions.)
Hayley