We bought our house & neglected garden 1.5 years ago. Last spring a somewhat scraggy shrub surprised us with a few white flowers on two or three branches that had a very strong lemony, jasmine scent.
After some judicious, yet heavy-handed pruning and a generous dose of feeding, we were rewarded with a full bloom this spring.
Some details: The flowers appear before the leaves start to emerge (bloom is almost over now and the leaves are pushing trough). This year bloom started in mid-March, last spring at the end of February, but we had an exceptionally mild (or none at all) winter of 2013/2014.
The flowers are slightly waxy and a bit translucent, around 2cm (3/4 in) in size. The scent is strong, like a mixture of jasmine and lemon.
It's deciduous, but a few leaves remain on lower, protected branches, see last picture.
The bark on older branches turns grey and tends to peel a bit, younger branches are golden brown, see first picture.
The average height is 1.5m (5ft) with a few individual branches up to 2m (6.5ft).
It's growth is rather "loose", even in summer with full foliage one can somewhat "see through" it.
But as it remains yet unidentified and hence unnamed, I trust in your expertise...