I'm starting a new model railway, I haven't done a layout before but I've only got a £150 budget for scenery, track and stations (excluding P&P). What can I buy? Updates start from when construction starts. And I've already got a Northern Class 142 until I get more rolling stock!
Unless you are buying secondhand, avoid Hornby track, it's expensive. I'd suggest 'Peco Streamline', which is basically just pointwork and flexible track so it will require a cutting tool (unless you are very, very, very lucky). However, £150 isn't going to go far with new track (nevermind the scenery!).
Scenery - For buildings (including stations), card kits are quite cheap and relatively effective, though some require a bit of skill (or dexterity) to complete.
General tip - finding everything at the cheapest price is no good if you are spending twice the difference in postage costs, try to minimise postage costs wherever possible.
What I suggest you do is think really hard about what you want from the layout. It's all very well collecting bits of track and scenery, but if it isn't what you need you are just throwing money away. Planning software like AnyRail or SCARM might be useful for you.