A Woosh Sirocco2 is (just) under £700 and should meet your needs.
It's now one of their older models, but it is well-proved and is a decent, sturdy bike.
http://www.wooshbikes.co.uk/?sirocco2
It's now one of their older models, but it is well-proved and is a decent, sturdy bike.
http://www.wooshbikes.co.uk/?sirocco2