even though im onli a s1 licence holder can i still enter a leauge/championship

You could, as long as said league uses all S1 combos, which is rare.

Quote from rc_king :

even though im onli a s1 licence holder can i still enter a leauge/championship

Try and get another 12 quid mate and get S2, its not worth just having S1 these days as theres only like one or two servers that run S1 content.

P.S : You're probably going to hear the above post about a 100 times from now on, so just get over and done with.