I know many will vote cold as is forwards facing but this Group 1 2 3 car seat will take your kid from 9months to 11 years for the small fee of £114.72.
One of the best rated seats in Germany (apparently). This is a non ISOFIX seat.
For those that would prefer an ISOFIX model the Cybex Silver Pallas-Fix Toddler Car Seat Group 1/2/3 (Blue Moon/ Navy Blue) is £143.http://www.amazon.co.uk/gp/product/B00DSKSGNW?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
Note: both listed items are not currently in stock & are awaiting stock updates. Other colours are available for differing prices. There is a chance that these will not come back into stock, but for me its worth the risk.
Normal price is £200 - £250.