I am certain Snipe are still trading - though they were bought out some years ago ?
http://www.snipetrailers.com/
This is their contact for spares from the current website >>> and I used them in June this year for the notorious "sealed" hubs ; I was surprsied to find out they were £60 cheaper than Trailer-tek, in stock, and delivered next day.
SPARES ORDERING
Spare parts for your trailer can be obtained
through our sister company:
Gordon Love Trailers, 192 Bridge Street West,
Newtown, Birmingham, B19 2YT.
T: +44 (0)121 359 6387 F: +44 (0)