Servis & Tricity
Nick
Welcome to AW from me too. Interesting dishwasher that Servis - its from about 1976 and there were several other (largely) identical machines branded with other names - Bendix and Electrolux are two that come to mind although they had a different latching machanism - Frigidaire is another one although it looked superficially rather different, its almost identical.
That Tricity oven is from the mid-late 1960s I think, I have one in my collection which is the next iteration (different control knobs and timer) - mine is filthy too. Time to get out the Oven Pride. These were all fundimentally the same up until they were phased out in, I think, the late 1980s with trim and colour changes and the addition of double and fan oven versions. It looks like yours might be missing two simple toggle switches from the centre of the control panel - one for oven light and one for rotesserie. There are plenty of these ovens around on ebay, sometimes with matching fridge and/or freezer if you decide its a bridge too far to restore this one. Look out for asbestos in the insulation too and, before you go too far, check the oven and grill elements actually work. There will be two elements in the oven, one on each side and they both need to work for even cooking.
The hob is much later than the oven, late 70s/early 80s - it probably replaced the previous radient ring model. Look out for Hob Brite to clean that up - it is very easily available.
Good luck
Al