try lubricating the rubber bushes in the wishbone and arb. Dry bushes are known to squeak. may not help, but not gonna cost anything
think thats ok , have used wd40/wash liquid in past , some ppl frown on that tho lol.
Mate i had the same thing recently and i'd put money on it it is your bottom/lower ball joint,the rubber has split and the joint has gone dry.Cheap to buy and easyish to do on stands.Chambo