I think a Leon would be a good bet for you, just not this one!
I've just bought an 08 Leon FR TDi (170) same as MattW's by all accounts and it's awesome so far... Goes like stink but still does over 40mpg!
I think the older shape FR TDi is also a great car, all the benefits of a high spec Golf but for much better money!
Check this one for example! 2006, 46k Miles, £7995
http://www.pistonheads.com/sales/1581786.htm
2005, 50k Miles, £7990
http://www.pistonheads.com/sales/1488705.htm
2005, 50k Miles, £7250
http://www.pistonheads.com/sales/1565425.htm