peirre:
As for claiming the cost of digi card & medicals, I suspect you can`t claim those
It’s always worth checking the HMRC website for the tax treatment of certain expenses whether you are employed or self-employed.
EIM66195 — Tax treatment of lorry drivers: purchase of digital tachograph cards - Digicard and photos tax-deductible.
EIM66190 - Tax treatment of lorry drivers: issue or renewal of HGV/LGV licences - Cost of licence renewal and medical is tax-deductible.
There are many more pages like it on the HMRC website.
A simple test is this: Is it wholly, exclusively and necessary for employment/business use?