A photo would be very helpful, hard to diagnose without one; there could be another cause for brown patches. Different conifer aphids affect different types of conifers, RHS link below on various types and treatment

https://www.rhs.org.uk/advice/profile?pid=931#:~:text=Aphids%20are%20sap%20sucking%20true,and%20in%20some%20cases%20dieback.

Otherwise, google 'brown patches on conifers UK' and select the RHS link for other causes.

Grows on you Not letting me add photos

Thanks for the links

try making them smaller if you can,that might work.

Took a few photos This one not the best but sort of shows the problem

Well I can see the browning,but no detail at all, unfortunately... you can see it closely, I can't, compare the symptoms with the RHS info on browning conifers, see if you can decide what the problem is....