Sandals for the office

[Pantsinthewash]

Feeling a bit stuck! I'm looking for some sandals I can wear to the office.

I thought I'd found a couple of pairs, but I realise I feel uncomfortable wearing them as they show too much toe! I just don't feel appropriately dressed and feel they are too informal for the office. I'm 60 plus, they can't be dead flat and max heel height about 2".

TIA!!

What do you think of these?
https://www.office.co.uk/view/search?search=hallie

https://www.cos.com/en_gbp/women/accessories/shoes/product.leather-slingback-sandals-black.1150473001.html

I really rate Cos sandals - I have a couple of pairs for work.

Thank you both so much for those suggestions, I like both! Never knew Cos did sandals!

I rate clarks for comfort- worth having a browse. Thought these few were lovely though:
https://www.clarks.com/en-gb/alda-strap/26176631-p
https://www.clarks.com/en-gb/kassanda-lily/26177295-p
https://www.clarks.com/en-gb/kimmei-bay/26176403-p
https://www.clarks.com/en-gb/kassanda-lily/26177297-p
https://www.clarks.com/en-gb/dash-lite-wish/26171949-p