Can I...

[SoozyWoozy]

...get my Phil & Teds E3 sport serviced anywhere?

I love my Oyster, but for trips to the beach etc, you can't beat P&T :) but the poor thing really is on its last legs.

Or is something my DH can do?

I would give Out n About in Bedford a call, or Buggy Pit Stop and see if either can help, or even your local P&T independent shop.