Blackcap Songs

Yesterday I was walking back through the woods near Frimley when I saw a male blackcap singing.  Its song was rather like a short version of a blackbird song.  A little further along the path a small bird flew across my path making a loud tak-tak-tak alarm call.  I took this to be a wren, but on closer inspection its was slim and warbler-like with a greyish body and some brown around its head (it didn't stay still long enough for me to get a good look).  This could have been a female blackcap as, according to BWPE-CE, blackcaps also make a tak-tak-tak sound