What are good cheap date ideas?

I've came up with a idea to solve the issue of me and my boyfriend never doing anything besides sitting in bed watching Netflixs finally.

I've found a little tin box and coloured coded date ideas such as *stuff to do at home *free things to do *places to eat *things to do under £40 (split between us) and *things to do over £40. I've also made a swear jar so whenever one of us swears we have to put change of any amount in the jar to fund us doing something fun together at the end of the year.

I've included ideas like baking/cooking together, playing a board game, going for a walk, going fishing, going to the movies, DIY projects etc.

Keep in mind I live in England the weather is pretty crap this time of year which is why its so difficult to find things to do for cheap. It's not like we can have picnics in the park or go to the beach. It's even more crap as there's not much to do in my town besides get drunk, we don't have anything fun or interesting to do or see. Also we are saving for a house together but can not get a mortgage till my boyfriend has three years worth of his business books so we both still live with are familys and we don't want to get in there way either. That's why I'm trying my best to be as creative as possible.
What are good cheap date ideas?
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