Well a genuine cambelt kit is about £140, dephaser is circa £160 now and end caps are £13ish, so thats £313 for those... Genuine waterpump is about £73-75, so about £390 for genuine everything.
Although, if you got a Gates cambelt kit instead (pretty much exactly the same considering they make the belts for Renault) which is £110, and a non genuine waterpump for around £25, you'd be looking at £310 for all the parts...
Aux belt kit is about £130 on top.