Need shopping advice in London

MalfordofLondon (an esteemed forum member) just posted this: http://www.styleforum.net/t/323464/uk-psa-lewin-navy-bengal-slim-fit-shirt-15, £15 for a TM Lewin shirt, can't go wrong. Also, check out his webstore - http://www.malfordoflondon.com/en/ great items at great prices.

For shoes, I have always had a good experience with http://www.jonesbootmaker.com/ & http://www.herringshoes.co.uk/

Sorry I only gave you online sources.. 

I live in London, but I shop at different places to you. I'd say at your budget, stick to:

1. Banana Republic
2. Uniqlo
3. Zara

For dress-shirts, usual suspects Jermyn Street re: Charles Tyrwhitt and TM Lewin. Forget Hawes & Curtis and Thomas Pink. The others exceed your budget. I personally prefer CT over TM Lewin - but try both. You'll need to dampen down your expectations on what 'slim' actually means in dress-shirts unless you go MTM or bespoke. I think that TM Lewin is a tad slimmer than CT.

Dress shoes expect to pay £150 upwards. Entry level Loake 1880 range or see if Charles Tyrwhitt has re-badged Loakes. Personally, I'd look to Meermin (online) classic collection. However, if you want a more English style then try John Ruston's on Wimpole Street.

Westfield? Casual  / street dress maybe. Personally, been to Westfield a couple of times and almost immediately head back to Selfridges, Jermyn Street or Nigel Hall and Nicole Fahri in Covent Garden.

Charles Tyrwhitt has most of the items you are looking for - except the glasses - and was my natural reaction to your post. They have multiple locations but there is one on Jermyn and one on Regent Street (5 min walk from each other). If you were to go to these locations you can easily branch out among the Regent Street shopping area for anything you might have missed.