Sat Nav updates

Just wondered if anyone had any experience of non-OEM sat nav updates.
Audi quote £239 inc Vat plus £78 coding fee. I was not surprised, having read all about the outrageous fees charged. But I am not forking out that amount. Apparently, that’s the cost for every Audi model from A1 upwards.
Looking at latestsatnav.co.uk who offer the correct upgrade at £69.99.
Bugger of it is I have top of the range TomTom which is subject of a complaint at the mo as it loses signal all the time and can’t be relied on, otherwise I might just use that.
I’d be grateful for any guidance.
Thommo

Thommo, Ill message you …

Thanks, Andy.
Here is image . . .

And here is what’s on offer with a £10 discount

Here is fuller detail

Be really interested to know what you can get, I’ve got 2 Audis that are a bit out of date

Andybond provided some info via PM but I think I’ll try the above option. I’ll let you know how I get on.