Delouis mayonnaise - quite expensive but the lowest carb bought mayonnaise that we have found

Hellman's full fat mayonnaise - less expensive though slightly higher carb than Delouis so keep an eye on portion size

Total full fat yoghurt

Lidl full fat yoghurt

Vanilla powder from Waitrose - this is pure vanilla pods and seeds ground up, no added liquids etc, so much purer

Black farmer sausages - very low carb, available from Sainsbury's and other supermarkets

https://www.amazon.co.uk/dp/B00SP31TCW?ref=ppxpopmobapshare

Electrolyte powder, as recommended by StuntNun