Free Museums and Galleries deals page discussion / Report top spots

Grrrlracer

Chard Museum, Chard, Somerset
Includes the history of powered flight, 50 years before the Wright brothers.

RCAConwy

The Royal Cambrian Academy of Art in Conwy North Wales is free to enter

Connie

War and Peace Museum, Oban, Argyll.

https://www.obanmuseum.org.uk/

sleepypotato

RAMM - Royal Albert Memorial Museum, in Exeter is free. It has a varied collection of animals and historical artefacts.

DevonAbbess

Tavistock Museum, Court Gate, TAVISTOCK,  Devon. Tucked away in the corner next to the old subscription Library and next to the Tourist Information Centre. Quirky layout. Focus is on Cornwall and Devon Mining Heritage landscape,  Bedford Cottages, Tavistock Abbey; birthplace of Sir Francis Drake and other useful local heritage information. Extensive photographic library.  Friendly, helpful volunteers.  Free entry.  1hr public carpark (£1) in front with disabled parking bays. 

Miss_Elly

Gold Hill Museum, Gold Hill, Shaftesbury SP7 8JW is free and I posted it last time I was invited to!
https://forums.moneysavingexpert.com/discussion/2361503/goldhillmuseum.org.uk

katrina82

The M&S Archive in Leeds is always free, with family friendly interactive exhibitions, and this Saturday free craft activities and free refreshments!

JaneDoeJohnDoe

https://www.hampshireculture.org.uk/westbury-manor-museum
http://www.bognormuseum.org/
https://thespring.co.uk/museum/about-the-spring-museum/
https://www.midhurstmuseumandtearooms.co.uk/
Four local town museums 
Westbury manor in the borough of Fareham
Bognor Regis in West Sussex
Spring Museum in Havant
Midhurst museum (once the smallest museum!)
All free & all great in their own way 

StanleyMSE

The Lancashire Police Museum, located in a wing of a former working prison within the historic Lancaster Castle, is FREE OF CHARGE but only open on Thursdays and Fridays (potentially some Saturdays too in the school Summer break but check first before attending). Great events and activities, especially during school half terms, etc. Groups can also pre-book a visit too. More info on their website. Sorry, as a forum newbie I cannot post the link yet.

tinasparkleRDG

In Reading we have The Museum of English Rural Life 
The Ure Museum of Greek Archaeology 
The Cole Museum of Zoology 
And the small but perfectly formed Riverside Museum at Blakes Lock

They are all free.