My tumble dryer only spins with a helping hand once it goes its fine but does not spin on its own until i spin it manually to get it going then shut door quick

Belt has jammed or drum has slipped out off drum guides

Do you hear the motor running? With door closed.
Most dryers will spin though a little hard to do so. If it spins VERY easy the belt is possibly broken.
If the dryer is several years old it Could be the belt.
Also check for a switch for the door, if there is one.
Door switch would shut off dryer when opened.

Sounds like loose belt. If the drum spins by hand, it's almost guaranteed to be a bad belt.

replace the broken drive belt

This could be a simple fix or the expensive one. Let's try the simple fix first. All dryers have a safety feature for when the washer spins ( mostly for kids to not stick hand in or open lid up when washer is spinning at high speed, to prevent injury) On the lid it self (underneath) has a peg or button that when closes goes into a slot or hole on top of the washer, otherwise known as a switch. Sometimes that switch goes out which has to work for the washer to spin, or has to be bypassed. If you don't know much about bypassing or wiring I would buy a new washer lid switch. There probably under 20 bucks, and easy to replace. Now the expens

The first decision you must make when buying a tumble dryer is whether to buy a vented or a condenser dryer. As you'd expect, there are pros and cons for both. This page helps you understand all of the differences, including the reliability and repair implications. Condensor tumble dryers are becoming more popular but vented tumble dryers still have some advantages and the convenience of not needing a venting hose (as always) requires some compromises.
Until I can put together my own reviews the best Tumble Dryer reviews available online are by Which?
Due to their resources and independence, Which? usually have the latest reviews and collect the opinions and experiences of thousands of members - Which? tumble dryer reviews (Plenty of free information but will need to be a subscriber (take advantage of the 1 month trial offer to get the full benefit)
Vented tumble dryers are cheaper than condenser dryers, they are also simpler, more reliable and more economical to run. According to Which? "on average, vented tumble dryers use about a fifth less energy than condenser dryers to dry a full load of cottons."
So why bother with a condenser tumble dryer? Well condenser tumble dryers are a convenience product but they do offer a solution to a genuine problem for some where venting the dryer outside is difficult or even impossible.
My advice would be that if your tumble dryer can be sited somewhere that allows you to correctly vent it outside, either through a wall or through a window, then a vented dryer is probably best. If this would be particularly awkward, then buy a good quality condenser dryer, which should condense the steam into water.
Modern washing machines now have a far superior spin speed, and, of the ones we recommend, the cheaper model has a 1200 spin speed, the other a 1400 spin speed... so your washing will be fairly reasonable (some items could be about ready to iron) and this, in turn, could affect your other choices.
Could you get away with just airers and a washing line? Or have you considered a dehumidifier?
A Spin Dryer... will work efficiently, and is cheap. The main advantage to it is that it is only the size of a large pedal bin, so it can be stored under the worktop in a small amount of space.
A Tumble Dryer... much more expensive... for a decent quality item you need to pay a quite steep price. They do a good job, but are another full size kitchen appliance to find room for.
A Washer/Dryer... instead of a washing machine... disadvantages, if it goes wrong then you have no back up in either the washing or drying department... and of course being a more complicated piece of machinery, it IS more likely to break down! The only advantage is that it will be a space saving item.]
please comment on these on how helpful.

Sounds like you have a dead zone in your motor...could be a replacement motor is called for. or continue to spin the drum by hand till the motor goes kaput...its cheaper

Belt mounted upside down. Slick side goes to tub on this odd ball machine.

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Not all that familiar with the Whiteknight dryer series but a dryer is a dryer and your problem sounds like it could be narrowed down to a few things. Based on your description of the problem and without knowing how much use that dryer has been subjected to, it sounds like you have a belt slipping ..or if it is configured like many other dryers..there may be a belt tensioner that came loose. In either case, the drive motor pulley spins andthe belt doesn't have enough tension or friction on the drum to rotate it. You might try cycling it without clothes to see if it spins up... if it does spin ( without assisting it) then once you add the weight of the clothes it doesn't have enough friction to spin the drum. Hope that helps !

There may be a capacitor in the motor circuit which has shorted out. The capacitor helps the motor start. If the capacitor is shorted, the motor won't start by itself, but will run fine if urged by hand. Good luck.