Hey it looks like the conversion I'm after. Could you share the links of the conversion kit and how much roughly that cost you?
You might be better served with a hub drive kit, but pre-Brexit, I paid about £100 less from this seller, and this exact kit (LG cells alledgedly, but I haven't opned the battery to check - will do when warranty expires):
Delivery was 3 working days after dispatch (4 working days) by UPS.
I messaged the seller first to ask if they had anything to send me from a UK warehouse, and luckily he did. Just click the "Ask a question" button:
If you are interested in that kit, you need to know if your bottom bracket is compatible, which might be as easy as finding the specs of your exact bike, or a right royal pain taking bits off to measure.
I think Woosh sells them too, and he seems to have a good preputation on these forums. If I had known of Woosh's existence, I might well have ordered from him - as it's a UK based business. Perhaps ask if they have them in stock? He/they might also be able to advise if your bottom bracket is compatible:
Woosh Bikes Ltd Electric bikes and kits assembled in Southend-On-Sea. Affordable and comfortable e-bikes to suit every pocket.
wooshbikes.co.uk
Also there's a more powerful kit quoted on another thread. I don't know anything about the company:
Hello, I'm new on here, and came to get some advice for a conversion I'm considering. We have a gazelle cabby cargo bike that would benefit from some assistance, but I'm wondering what i should be looking for. Currently I'm thinking of a UK road legal 250w Bafang mid drive with as much battery...
www.pedelecs.co.uk
This might be the kit:
Bafang BBS01B-ETM 36V 250W mid-drive complete conversion kit including LG MH1 cell battery
www.brightonebikes.co.uk
The battery looks a bit light for me - I don't like pedalling and use max Pedal Assist at all times, which is why I went with a 19.2ah.
...and my bike still folds lol: