In that time, it has now become a dandelion bed, i.e there is now very little grass visible and is now basically full of dandelions.
I see I have several options:
Dig it all up and lay new turf.... how long do the dandelion tap roots go down and how do I ensure I get the entire tap roots out?
Apply a total weedkiller, wait several months and then reseed with grass seed
Apply a selective weedkiller to kill just the dandelions and hope the grass then regrows and fills in the space left by the dandelions
Pay GreenThumb or similar X quid a month and get them to visit several times a year and sort it out for me.
What do the panel think?