Yep, long screw driver straight up behind the number plate with someone holding the bonnet down.
The cable had jumped out at the bonnet release end, cable ties are wonderful things. The cable casing at the other end has come out of it's holder so you have to hold the casing to pop the bonnet but it works.
Speedo seems fine now Fred, bit of use has freed it up. Clock works when you set it then shuts off soon after, will probably just leave that. The temp gauge barely moves, if someone can tell me where the sending is I'll try earthing the wire to the engine to see if it's the gauge or the sender.
I've been in touch with a local trim shop, they are going to look at the small tear in the rear seat. Also going to get a gear stick gaiter to go over the split rubber one.
https://www.ebay.co.uk/itm/black-stitch-FITS-VAUXHALL-FIRENZA-HPF-VIVA-MAGNUM-SPORTSHATCH-LTHR-GEAR-GAITER/351001390507