I've tried caesar shift using Q as E (based on frequency) so M is A but that failed epicly... also tried a viginere using GCHQ as the key word but again failed

I've tried caesar shift using Q as E (based on frequency) so M is A but that failed epicly... also tried a viginere using GCHQ as the key word but again failed epicly :L Not even bothering with Playfair. simple letter to Ascii doesn't work either and i really can't be bothered with going stupidly complicated :/