I have had a dwarf plum tree quite near (8-10m apart) from my apricot for a year now ever since I planted them both around the same time. I've noticed that the plum has quite severe plum pox and I am getting rid of it right now. However, I'm not sure if the apricot isn't infected by now too as they only show symptoms after some time. Is there a way to test for the disease at home or even send off leaf samples to a lab somewhere to test (I'm really keen on the apricot). I live in London, UK so if some sending off is required, the testing facility should be around here. Please help...

Thanks in advance