I work at a bike charity as a volunteer mechanic. We have a guy who converts normal bikes to electric but a conversion isn't cheap. We're not in Manchester but I wouldn't try and convert that road bike you have. A conversion usually involves replacing either the front or back wheel with one with a motor in it. They weigh an absolute ton. You might be better off looking for a second hand road ebike that's got a mid drive motor. I'm sure there will be a lot of replies to your post so it'll be interesting to see who says what but from my limited experience, and having seen how these conversions are done, I wouldn't spoil a decent road bike by having it converted. Conversions IMO are more suited to hybrids but that's just an opinion.
By the way.....if you're out on a ride and have a puncture it's a challenge to change a tube. We do puncture repairs in the workshop and they're not an easy fix. If you have a mid drive it's a lot easier.
I disagree on the puncture question
I have had 4 ebikes (long story!) and 3 have been rear wheel motor
2 of them have a plug on the power cable near the rear hub - unplug that and the rear wheel comes out just like a normal bike - just a bit heavier but easy enough to lift with no trouble at all
The first one (PowaCycle Salisbury) was more of a problem because the cable was hardwired from the battery all the way to the motor - but you could easily loosen the wheel nuts and lift the wheel out slightly - then remove the tyre and tube from the side without the cable
I had quite a few punctures before I found puncture proof tyres - and never had a problem with changing the tube - either on the road/track or at home
and this is without a proper stand - just normal flipping the bike over
I presume you weight comment was based on hub motors which as far bigger than mine have been - and hence possibly illegal for road use - which would explain the extra weight I suppose
