You can spot an affordable area that is potentially is on the up if you know what to look for.
Which?  suggests that one good way to spot such a location is if there are several new-build developments appearing in quick succession in an area. House builders are skilled at spotting the areas with the most potential and developing homes there, so multiple developments in an area would indicate an area that has the potential for increasing property values.
Other good indicators are if the local authority has plans to regenerate the town centre and improve transport links, or if the area is next to a thriving town that some buyers are starting to find themselves priced out of.
If you spot new estate agents offices opening, trendy shops and cafes beginning to appear, and new schools being built, then these can all be signs of a location on the up.