Badger Farm is peculiar in terms of planning as most permitted development rights have been removed for most properties. This means that any work, including erecting fences, requires planning permission. However, there are some houses with permitted development rights on Badger Farm. It is also worth noting that not all permitted development rights on all properties have been removed. A few permitted development rights still exist on a limited number of properties. The only way to be certain of your rights is to do a search on an individual property via the Winchester City Council Planning Department.
https://www.winchester.gov.uk/planning/pre-application-service/do-i-need-planning-permission
Before starting a project (including hard landscaping for gardens), it can be useful to establish where the various services (gas, electric, telephone, etc.) enter your property.
If you register with this website as a private individual, they will, free of charge, send you a plan of where any utilities registered with them are buried. SGN (gas) and SSE (electricity) are both covered by this website. They are also able to supply contact details for services not registered with them.
Commencing work without being sure of your planning rights can be a costly business as Winchester City Council can require work to be changed or taken down through its enforcement powers.