OV9

Amazon have the CTEK MXS5.0 for £66.46 currently, cheapest I've seen it for ages: https://www.amazon.co.uk/CTEK-Battery-A ... B00FC42HAA

The extension leads are also discounted.

For those of us without a garage (and so not able to use one of those fancy pants trickle chargers) how about a chunky 2000A NOCO jump starter for seventy quid off

https://www.amazon.co.uk/NOCO-GB70-Ultr ... B016UG6PWE

Viofo also have a few quid off too across their range, if you're looking for what is generally agreed to be one of the better dashcams on the market

4k60 (front) + 2k30 (rear) dashcam = £305, usually £360 - price doesn't include cursing as you try to sneak the wires through the headlining.
https://www.amazon.co.uk/dp/B0FH98TN1G

The GOOLOO equivalent is just over £40, I've had it a couple of years and started several cars with it (usually my neighbours). https://amzn.eu/d/0eagbeHl

4 litres of Magnatec full synth for £30 will sort out the Stepwgn for another year.