Warped head

[BigStan]

I have recently found after going to top up my oil levels that there is a browny/orangey sludge on the oil cap and inside the rocker cover aswell, i have been told that my head gasket has gone and obviously need to get it sorted !
Because i havent noticed for a long time and so do not know when this happened i was also told my head might be warped, i have discussed this with a friend and thought that if it was warped then surely it would affect my oil pressure aswell ?
As i dont know when it went, and so on can somebody please inform me of the usual oil pressure, its on a standard GTE !

All info appreciated ! Cheers

[Tazzy]

itll just be the head gasket

[BigStan]

Why not a warped head then because isnt it quite likely ?
i havent noticed any difference in performance, my oil pressure stays just over half way when goin along ! Is that ok ?
Cheers