Travelling during working day

[Dutchhouse14]

I usually work from home but we have a small office (that isn't big enough to house, all employees) that is my official working location.
Once a week I travel to another site( not my official working location) in the middle of my working day. Ie start work at home, go to this other location to compete a task that can only be done there, then drive back home and continue working.
Manager has just picked up on me using working time to travel to and from this location. She has asked me to log as finishing work on my spreadsheet when I leave home, then log time of arrival time at other location as restarting work then do the same back again.
I challenged this as
A) it's in middle of my working day and it's not a location I can work all day from
And
B) it's not my official working location so not a normal commute

HR policy is wooly and she's going to check with them but AIBU to challenge her on it?

From what the OP posted, her specified place of work is not where she drives to, so even if they did revoked WFH they would need to rewrite her contract and she would still need extra insurance as her place of work is not where she is driving too.

My employer closed their offices a few years ago and has been in the slow process of renovating a new one, still not open. When it does it has about 50 desks and there are 300 employees so the presumption is to WFH which is what I've been doing for over 5 years.
The site I travel to is owned by my company but it's not the usual place of work stipulated on my contract.
I can't work there all day, I need to book a meeting room and access to equipment that is stored there, complete the task then I go back home and continue working.

You haven't answered how far away it is from your home. Do you have to go there in the middle of the working day or could you start there at nine, do whatever you need and then go home?

As it stands though, it does sound like it's not commuting, so you are not insured to do the trip. You need work to pay for business class insurance.

'Work' don't need to pay for business insurance - the employee ticks that box when they renew their insurance each year.

They may not need to, but they should. If we need to use our own transport for work, they pay the additional cost for business insurance.

How long does it take to commute to your base office, and how long to the other office? My company policy is it’s work time for everything above your base office commute, yours may be similar. So if it takes you 1 hour to commute to base office but 1.5 hours to commute to the other office you’d get 30 mins each way covered in work time to the other office.

Not just teachers. (Though my husband was a music peri). The law refers to people like plumbers & care workers. In the case of care workers the travel took them below National minimum wage & a case was brought. There is currently a case going to appeal about travel took them first client of the day.

Car insurance always used to include commuting to a single place of work but not all do now. My parents recently found out they were not covered & I had to tick an extra box when I renewed mine.

that is separate to business insurance which you need if you use your car to travel between clients/workplaces.

To answer questions the new, as yet unopened, office will be about 30mins away and so is this other location. So it's a fair point that if I was to drive there and back it wouldnt take anymore time.
However if I went into the office I would be able to book a desk and work there all day.
The other location has no desk I can work at, I need to book the meeting room, which has limited availability, to access the equipment I need for the task.
Sometimes I'm able to go there first thing, in which case I don't claim travel as I haven't started work but it's not always possible.
Tbh it's a really disruptive going there but I thought if at least I was travelling in work time it wouldn't be too bad. I don't claim any mileage as its similar distance. My car insurance includes commuting so assume that's OK.
I'm considering putting in a flexible working request to formalise what I actually do-work from home 95% of the time.
Employers sold the old large office with enough space for all staff to come in at same time (everyone had a permanent desk) and have bought a small office where only about 15% of employees can come in at the same time. This office hasn't been opened yet and for over 5 years we have all been working from home but contract now states that the new offices is our "usual" place of work which isn't accurate our "usual" place of work is home.
They've saved loads of money on office space/made a profit but still put the too small office as our usual working location on our contract even though they expect us to WFH the vast majority of the time.