In reply to peppermill:
The replacement buttons are just some fella bodging something with his 3D printer. Functional but not actually waterproof, so no actual imprudent on what I already had.
In the end, I spent a few quid on some waterproof PVA and gave it several coats to make sure no water can get in. Not tested it in a downpour yet, but the forecast for the next week looks promising!
I'll try to keep it going a little longer, but will no doubt eventually upgrade. Goodness knows which one I should choose though, the choice is baffling
Refurbished unit sounds promising. Something to look into.
GTE