Holy Island by public transport

[TheConstantLurker]

Google is proving unhelpful: the tides timetable is available from the post office on the island. Great. Buses run to Blean and some buses run to the island. Great.
How the heck do I time a train arrival into Berwick upon Tweed and then transport to the island for two adults, one dippy grandma/mil and three children?

[TheConstantLurker]

Beal.

Actually have just found some more useful bus stuff but would still appreciate any experience of doing this trip please.

[TheConstantLurker]

Hahaha "on certain days there is a bus service", "services are timed to connect with some, but not all Berwick buses" Great.

[MerrilyWatkins]

The tide times are here. Not sure about buses though.

[InvaderZim]

Bus to nearby then taxi?

[CocktailQueen]

Lordy. Can u hire a car from Berwick instead? Have seen bus stops but never a bus on our trips to holy island!! And you can't really walk the causeway, t's too far.