I think I messes last thread up & stopped answers so am re doing it with photos..
had a reply saying poss a poplar..no idea how it materalised as was potting seed my duahgter brought back from spain in pkt...was put in pot under my lean to roof..no poplars around here...!
Changed my mind, jean - just had a look at a self-sown Birch in my garden and leaves look identical.
yes, I have been looking online & at bottom of garden a neighbour has a silver birch..
so I agree with you....
thats the problem solved now..many thanks for your help.. nothing exotic then ha haa..