After much deliberation, I decided on which flavour of insulation and lighting I'd be using in the new shed. Due to space restrictions I will be using Airtec Double Insulation, heavy duty bubble wrap covered in tin foil both sides, supposedly this stuff has the same thermal efficiency as 2" polystyrene. Even if its half as good as what the manufacturer states, it'll be more than sufficient, and if nothing else will almost put an end to most, if not all, of the draughts. When it came to the lighting, I ordered a 5ft long 58 watt weatherproof bayonet (strip light) which came with the tube and light diffuser. There may well be more lighting installed at a later date over the work bench as the far ends of the shed are a little dark, not like dark dark, but enough for me to think that it might be best for it to be a little brighter, we'll see...
This evening I sat in my recliner, in the warm and wired up the light, for the mean time I have simply fitted a plug to the end of the wiring and have it running off of an extension lead running from its own fuse in the main shed, sure its a bit ghetto, but, its light so I'm not complaining.
This was the first time I have every ordered from Screwfix for home delivery, to my surprise their delivery service is exactly as advertised and I received my items in under 24 hours from placing my order, needless to say, once I have decided on what's living where, the location of the workbenches and shelving etc, I will be ordering all the rest of the electrical stuff from there.