Bivouac sack, bivy, bivvy, bivi bags and bloody bivvying

+1 for tarp! I have a Rab tarp which has been really useful, both for bivi in Scotland and tent camping to give something to cook/sit under.

If i had to choose between just bivvy or just tarp in Feb i'd prefer bivvy. Tarp is probably better if it definitely going to rain, bivvy is better if it's cold.

i like my alpkit ones, but some find it a bit condensationy. Doubt that'll be a problem in Feb
https://www.alpkit.com/products/hunka-cosmetic-seconds

get that and a cheap tiny tarp you'll be (mostly) covered for anything
https://www.ebay.co.uk/itm/Ultralight-Waterproof-Camping-2-Person-Tent-Tarp-Footprint-Ground-Sheet-Mat/302784418398?hash=item467f5b925e:m:mRTuPpN0ozTXMNGstgDtDyg:rk:7:pf:0

I had a basha years ago, gave it to a homeless friend in the end. Would totally recommend a lightweight tarp - I rated having a basha, and suppose a tarp is way lighter same thing.

Sorry I mean I used a basha in conjunction with an army bivvy. Was ideal. Would recommend a lightweight tarp in conjunction with any bivvy for belts&braces.