I'm hesitant to make recommendations as I don't know what chemicals are available in England and (although it appears to be fescue) not knowing what type of turf you have. I've attached a link that you can use to identify turf grasses and weeds to aid you. Before using it, you might want to ask to ask whoever installed the sod for the name of the nursery they used. Contact the nursery and ask them what cultivars they use for their sod.
Any product containing 2,4-Dichlorophenoxyacetic acid should be safe for killing broadleaf weeds in a cool season turf stand.

Here is a link that might be useful: Weed and Grass Identification

Agree on using a 2,4-d product on the broad leaf weeds. Spot spray. Here I would suggest using Weed-b-gone by Ortho. All you have to do is mist the leaves of the weed. Do not drench the soil. Grass should be unaffected by a 2,4-d product.

The grassy weed will have to be pulled. Get on that now before it gets to to be too much.

Thanks for all the advice I have tried pulling the grassy weed but the stem/root is strong and they keep snapping

Loosen the soil by sticking a screwdriver down next to the stem of the grassy weed. Wiggle the screwdriver and then try to get the entire root out.

Hi all thanks for you advice I just got hold of the turf supplier and the turf is called mm22 it comprises of
30% Pontiac rye grass
20% San remo rye grass
20% mocassia fescue
25% felix creeping red fescue
2.5% Sefton brown top
2.5% highland brown top
Now after talking to the nursery they say the highland brown top will grow a lot quicker this time of year but as I don't have a lot of it (pic4) what would be the best way to get rid of it thanks for looking

According to me, the installing of the turf is not proper. You were supposed to add 25mm of compost to the first 50 mm of soil. Though you added topsoil other weeds were able to grow from them in between them. And still if you were not able to find a better solution for your problem then call the lawn care team. They will definitely have some solution for your lawn. If you waste your time in finding the problem, your lawn will be more in trouble. So, better late than never.

Here is a link that might be useful: lawn care suppliers

Hmmmmm! The brown top grasses are used as golf greens in the cool parts of the world. Wonder why those short grasses were mixed in with the tall fescue and rye? Usually people mow their lawns too short and those grasses will form a mat low to the ground. When they are mowed higher they are more manageable. But those coarse blades with the yellowish color are not the brown tops.

I'd take your picture and some samples to the nursery and ask them. It might be a variety of grass that is common in your area and not that common here.