@t-tony - many thanks Tony for the helpful info. Will look in Lidls
My query in this thread was in terms of laying up a car was prompted by some feedback in a MG club magazine (Dec) issue that I saw. The previous issue had a members report concerning the MG3 where the battery did not seem to hold its charge after standing for 10 days. Another member who had a Ferrari F8 (bought in 2022) and it suffered from a flat battery and the long and short of it, he was advised to use a trickle charger.
However, the battery failed and the advice from Ferrari was that although a trickle charger was suitable it should be disconnected from time to time and the car started so that it could be chraged by "proper charging levels".
In a similar thread on this forum (unfortunately I cannot relocate it) a member wrote that when using a trickle charger one had to do "it through the car's charging system under the bonnet" and not just to connect the trckle charger to the battery terminals.
I have also heard that should one diconnect/ remove the battery (for charging or any other reason) then the car has to be "told"to accept the new battery.
All advice greatly appreciated.