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GrassrootsHealth D action offer $30 postal finger prick 25(OH)D tests.
As this is part of a trial the Grassrootshealth people are subsidizing the cost of the test so you may feel you want to donate as well.

The Vitamin D Council another charity providing cheapish postal 25(OH)d fingerprick blood spot tests.

If you want to watch what these tests involve then you can watch the process on you tube But for the Grassrootshealth version you only provide 2 spots of blood and the sample collection tissue only provides 4 collection sites but it's pretty easy.

You may find it easier to use the above than have to drag into your surgery and then maybe visit the path lab but depends on finance and convenience really.

As most people don't spend all summer naked outdoors it is most likely, unless you have already been consuming 5000iu/daily for at least 3 months, that you will be low so supplement for 3 months BEFORE you spend money on a test. When it's in your body D3 has a half life of 3 weeks so it depreciates roughly 17% a week so it's much easier to lose surplus D3 than get a sufficient store in the first place. Imagine how hard you would have to save if the money you put in your savings account depreciated at 17% EACH WEEK. It's bad enough hardly getting any interest on it.

The vitamin D council have links to good sources of 5000iu/D3
I have used these Bio tech
and
These Iherb Now foods 5000iu both are much cheaper than Seek Natural.
WAB666 earns you a $5 Iherb discount.
Watch the Customs duty charge on orders costing more than £18 as the Post Office charge £8 to collect it.
I usually tell people to limit order to 3 pots of 120, use a $5 discount code and that just sneeks under the tax threshold but use an online currency converter to check it's less than £18 after the discount but BEFORE p&p.

UVB is required for vitamin d production.
So HOME SUNBEDS (where you are certain you have bought HIGH UVB output tubes) will provide a good source of D3 BUT UK/EEC rules limit the UVB content of COMMERCIAL tanning beds so they DON'T have a natural level of UVB so won't raise your Vitamin D status.

Regular midday sun exposure, full body prone, sessions of 20~30minutes maximum are best for vitamin d.
The process is self limiting, once D3 is made if it stays on or near the surface of the skin, the longer it remains exposed to UVB the sooner it will be processed on into suprasterols the body cannot use.
Staying in the sun for too long is counterproductive as by the time you skin burns ALL the vitamin d near the skin surface will be destroyed and will not therefore be available to help the reconstruction or deal with the inflammation.
That is why FULL body sun exposure is needed.
Simply exposing hands and face for longer doesn't work.
We know that men working outdoors, all day everyday in Omaha only average 2800iu/daily and were deficient in winter.