I like the cap in the first picture, looks an early shade of dpm.
The buttoned smock liner is for the arctic and SAS windproofs. The type used with the parka has velcro ties; the sleeveless type is for wear under the combat smock.
Your arctic smock is from about 1985 according to my list of contract numbers. The trousers look the same age or a bit later - they have a dark green shade to the dpm that you don't find before that.
Are the LW trousers Imperial or metric sized? Sounds like they were on the cusp of a pattern transition. Contract number would help.
I think the HM Supplies smocks were made from the mid 80s to sometime in the 90s. They were private purchase and not an issue item.
Very nice colour to the 3rd jungle hat down, it has a 1970s look and has been cut down as they often were. Also a good early S6 bag in the same photo.
That helmet is the one that followed the Mk6, I think a Mk6a but not certain. Mesh liner pad instead of three joined cords (perhaps you already knew this.)
The woollen cuffs are a parka mod, they weren't ever made like that.
The green-white reversible smock looks to be in very good condition. Usually the white coating is flaking off. These are not common, and if it's Size S, M or L then it's early and a really rare find. They were used a lot in the Falklands campaign but I think I have read that our chaps were discouraged from using the trousers. I've never seen an early pair of the trousers.
Nice early 70s para beret. They are scarce!
The dpm helmet cover seems to be a c. 1985 contract, so yes a rare early one. I haven't seen one with a CT contract number before, only ever with SL32 or 34.
I like the Arktis chest rig. It looks quite early to me, possibly late 1980s going by the dpm colour and general appearance. From about the mid-90s they have a label inside the flap with the company telephone number. The ones before that just have the small "Arktis" label on the outside.
I think the desert hat is probably early, going by the small ventilation grommets. The early Granby uniforms had a tendency to fade to that colour. If there is a maker's name on the label they are Granby period, if not they are later.
Great thread! Your surplus store sounds like the sort of place we all want to find! Sadly it doesn't happen as often as we'd like.....