After trawling the high street and the internet to no avail looking for good basic tshirts that don't stop at my navel, today I finally found them - in George at ASDA of all places.
They are perfect, good quality, reach to the top of my thigh and lots of colours.
I've posted on here before about finding long tops - and seen lots of other posters ask too so thought I would share in case anyone else is looking.
And only £5 each too.