star's image is a Clivia and they are not really hardy outdoors in the UK so I think that is unlikely. My best bet is a tulip.
I have literally just had the same problem with my Hebe! I have now moved mine into a large pot as it was in my rockery! It took some serious digging out as well! x
I did wonder if it could be a clivia HCA. Mine is in a pot indoors and doesn't like being outside even in summer.
The flower of Clivia is very distinctive but it is not so easy with just leaves. I have a feeling that the leaves grow opposite each other but I am not sure!
You're right re clivia leaves HCA.
I won a clivia in a raffle and had to have it ID'd here.
one is a Hebe, I lightly prune mine when it finishes flowering but not too far into the old wood.
the second I think is a Aquilegia and a allim.
the third is a dead lavender, they like well drained soil and a sunny spot, has been said English lavender are slightly hardier than French.