Thanks folks!
Why bother! Armageddon's coming!
Fokyc no my bet is that my tree will outlive the WTS, but if I'm wrong then the Dubs can enjoy it in the new system. I'm that nice a guy.
Purps they're lovely trees, and they're the flowering pears you spoke about? If I can find one they look ideal.
Great links Jeff and Rachel. Thanks. That plant finder is really handy Rachel.
Juni I like maples but I'm worried they'd be too susceptible to wind damage. I'll speak to the people at the nusrery about it.
Emo yes the Rowan is another good option. I'll look into how fast it can grow.
Carla I've already got a flowering crab and the magnolia I don't think will be big enough but thanks anyway.
Cheers again
Clam