Everbuild Forever White Anti-Mould Silicone Sealant – Permanently Waterproof – Suitable for Internal And External Use – White – 295ml : Amazon.co.uk: DIY & Tools
Soudal Trade Exterior Frame Silicone White 270ml | Totem Timber
GE Sealants | Paintable Silicone All Projects Window & Door Sealant
No Nonsense Exterior Frame Sealant White 310ml - Screwfix
Amazon.com: Red Devil 0785 StormGuard 920 100% RTV Silicone Sealant, A Water-Resistant Adhesive for Interior and Exterior Use, 2.8 oz. Tube, White, 1-Pack : Everything Else