- Paddington - 4 companies
- Paddock Wood - 1 company
- Padiham - 1 company
- Paignton - 34 companies
- Paignton Devon - 1 company
- Paisley - 51 companies
- Paistley - 1 company
- Palmers Green - 1 company
- Par - 3 companies
- Parbold - 1 company
- Parc Nantgarw - 1 company
- Park Gate - 1 company
- Park Royal - 1 company
- Parkgate - 1 company
- Partridge Green - 1 company
- Patching, nr Worthing - 1 company
- Pathhead - 2 companies
- Pattingham - 1 company
- Peacehaven - 12 companies
- Peckham - 1 company
- Peebles - 5 companies
- Peel - 1 company
- Pemberton - 2 companies
- Pembridge - 1 company
- Pembroke - 2 companies
- Pembroke Dock - 13 companies
- Pembrokeshire - 7 companies
- Penarth - 18 companies
- Pencader Carms - 1 company
- Pendeford - 1 company
- Penicuik - 8 companies
- Penkridge - 4 companies
- Penllergaer - 1 company
- Penmaenmawr - 1 company
- Penn - 1 company
- Pennygillam Industrial Estate - 1 company
- Penoced - 1 company
- Penrith - 27 companies
- Penryn - 18 companies
- penshaw - 1 company
- Penshurst - 1 company
- Pentre - 1 company
- Penzance - 12 companies
- Perivale - 2 companies
- Perranporth - 3 companies
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