Apologies if this has been discussed in very recent memory but I do need to know.
I have always been under the assumption that it is grammatically correct to say 'I was sitting' not 'I was sat', 'I was standing' not 'I was stood'. If I am wrong then I will beat myself with a wet flannel. However I do need to know because 'I was sat' and 'I was stood' feel painfully wrong and make me want to shout.