Welcome to the forum Cambia, we are mixed bunch who usually aren't to serious and any leg pulling is quite normal
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Before you buy go and try a few different types of bike to see what might to suit your needs then come and ask your questions.
You have set out you budget, what style of bike are you looking for ? The lightest 1k bike will be about 18kg other wise most will be up to 25kg.
For your budget well known sellers on here are dare I say, Woosh. Also have a look at Wisper, Kudos,Juicy & Freego.
If it is only occasional use then you could go really budget and the £500 folder that comes up on Ideal world. Although folders aren't every ones ideal bike they are more then capable for ambling around on and along canal paths.
I believe there are a good few ebike vendors in Yorkshire, so some one on here local to your area will point you in the right direction.